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Settlement Agreement Filed with Regulatory Agency [Member] Settlement Agreement Filed with Regulatory Agency Change in certain operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Proceeds from Issuance of Debt Common stock, shares, issued Common Stock, Shares, Issued Proceeds from issuance of common stock Proceeds, (net of issuance costs) At The Market Equity Program Proceeds from Sale of Stock At The Market Equity Program Proceeds from Sale of Stock Income Statement [Abstract] Income Statement [Abstract] Entity Address, State or Province Entity Address, State or Province Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Error Correction, Other Error Correction, Other [Member] Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Basic and Diluted [Abstract] Weighted average number of shares of common stock, basic and diluted[Abstract] Regulatory Agency [Domain] Regulatory Agency [Domain] Defined Benefit Plan, Amortization of Gain (Loss) Recognized net actuarial loss Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] [Default] Loss Contingencies [Table] Regulatory Liability [Axis] Regulatory Liability [Axis] (Tax) benefit on net unrealized gains (losses) on commodity derivatives Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax Amount outstanding Short-Term Debt, Total Notes payable Short-Term Debt Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Customer [Axis] Customer [Axis] Reclassification adjustments of benefit plan liability - net loss (net of tax of $0.0, $0.0, $0.0, and $(0.1), respectively) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Defined Contribution Plan Retirement Plan Name [Domain] Arkansas Public Service Commission Arkansas Public Service Commission [Member] Arkansas Public Service Commission Treasury Stock, Common, Shares Treasury stock, shares Cover [Abstract] Net change in cash, restricted cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Earnings Per Share, Basic, Total Earnings per share, Basic (usd per share) Earnings Per Share, Basic Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Defined Contribution Plan, Company Retirement Defined Contribution Plan, Company Retirement [Member] The Company Retirement portion of the defined contribution plan in which there is no employee contribtuion required to receive a contribution. The contribution is based on a calculation of age and service. [Member] Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Operating expenses: Operating Expenses [Abstract] Write-offs and Other Deductions Accounts Receivable, Allowance for Credit Loss, Writeoff Regulatory liabilities, current Regulatory liabilities, current Regulatory Liability, Current Number of shares issued At The Market Equity Offering Program Share Issued But Not Settled At the market equity offering program share issued but not settled. Consolidation Items [Domain] Consolidation Items [Domain] Risk Management And Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Transfers of production tax credits to third party. Transfers of Production Tax Credits to Third Party Transfers of production tax credits to third party Line of Credit Facility, Average Outstanding Amount Average amount outstanding (based on daily outstanding balances) Senior unsecured notes due 2035. Senior Unsecured Notes Due 2035 [Member] Long-term debt, including current maturities Total Long-Term Debt, Total Long-Term Debt Retained Earnings (Accumulated Deficit), Total Retained earnings Retained Earnings (Accumulated Deficit) Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Current assets: Assets, Current [Abstract] Employee benefit plan costs and related deferred taxes Employee Benefit Plans And Related Deferred Taxes Liabilities [Member] Employee benefit plans and related deferred taxes liabilities. Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Product and Service [Domain] Product and Service [Domain] Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End Accumulated Other Comprehensive Income (Loss), Net of Tax Debt Instrument [Line Items] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges Cash Flow Hedging Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Debt Instrument, Term Debt Instrument, Term Black Hills Energy - Colorado Electric Black Hills Energy - Colorado Electric [Member] Black Hills Energy - Colorado Electric Total property, plant and equipment, net Property, plant and equipment of variable interest entities, net Property, Plant and Equipment, Net Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] June 16, 2023 ATM Program June Sixteen Twenty Twenty Three ATM Program [Member] June 16, 2023 ATM program. Regulated Operations [Abstract] Regulated Operations [Abstract] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Schedule of Fair Value Hierarchy, Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Regulatory Matters Schedule of Regulatory Assets and Liabilities [Text Block] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Wyoming Electric Wyoming Electric [Member] Wyoming Electric [Member] Public utilities amount of requested system safety and integrity rider be moved to base rates and termination. Public Utilities Amount Of Requested System Safety And Integrity Rider Be Moved To Base Rates and Termination Public Utilities, Amount of Requested System Safety and Integrity Rider be Moved to Base Rates and Termination Net amortization of prior service costs Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Entity [Domain] Entity [Domain] Derivative, Gain (Loss) on Derivative, Net, Total Derivative, Gain (Loss) on Derivative, Net Derivative, Gain (Loss) on Derivative, Net Restricted Stock Restricted Stock [Member] Equity Components [Axis] Equity Components [Axis] Deferred energy and gas costs Deferred energy and fuel cost adjustments Deferred Fuel Costs [Member] Entity Address, Address Line One Entity Address, Address Line One Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share Reconciliation Contract Subject to Master Netting Contract Subject to Master Netting Arrangement [Member] Contract Subject to Master Netting Arrangement [Member] Employee-related Liabilities, Current, Total Accrued employee compensation, benefits and withholdings Employee-related Liabilities, Current WPSC Approved a Settlement Agreement for a General Rate Increase WPSC Approved a Settlement Agreement for a General Rate Increase [Member] WPSC approved a settlement agreement for a general rate increase. Hedging Designation [Domain] Hedging Designation [Domain] Consolidated indebtedness to capitalization ratio Ratio of Indebtedness to Net Capital Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments Subsequent Event Type [Axis] Subsequent Event Type [Axis] Total other income (expense) Nonoperating Income (Expense) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Line of Credit Facility, Maximum Borrowing Capacity Maximum amount outstanding (based on daily outstanding balances) Hedging Relationship [Axis] Hedging Relationship [Axis] Fair Value Measurements Derivatives and Fair Value [Text Block] Black Hills Energy - Iowa Gas Black Hills Energy - Iowa Gas [Member] Black Hills Energy - Iowa Gas Energy Related Inventory, Other Fossil Fuel Fuel - Electric Utilities At The Market Equity Offering Program At The Market Equity Offering Program [Member] At the market equity offering program. Amendment Flag Amendment Flag Net income attributable to non-controlling interest Less: comprehensive income attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest, Total Net Income (Loss) Attributable to Noncontrolling Interest Rule 10b5-1 Arrangement Modified Rule 10b5-1 Arr Modified [Flag] Rule 10b5-1 arr modified flag. Number Of One-Year Extension Options Number Of One-Year Extension Options Number Of One-Year Extension Options Net periodic expense Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Net income available for common stock Position [Axis] Variable Rate [Domain] Other Stockholders' Equity, Other Customer [Domain] Customer [Domain] Interest Expense Interest Expense [Member] Other regulatory assets Other Regulatory Assets [Member] Other regulatory assets [Member] Equity Component [Domain] Equity Component [Domain] Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities [Table Text Block] Schedule of Regulatory Assets and Liabilities Transmission Service Agreement Transmission Service Agreement [Member] Short-Term Debt [Line Items] Gas Utilities Gas Utilities [Member] Gas Utilities [Member] Supplemental Balance Sheet Disclosures [Text Block] Selected Balance Sheet Information Other income (expense), net Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Accounts payable and other current liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Treasury Stock, Common [Member] Treasury Stock Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider. Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider. [Member] Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider. Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Employee Benefit Plans Retirement Benefits [Text Block] Public Utilities, Term Extension of System Saftey and Integrity Rider Public Utilities, Term Extension of System Saftey and Integrity Rider Public Utilities, Term Extension of System Saftey and Integrity Rider Additions Charged to Costs and Expenses Accounts Receivable, Credit Loss Expense (Reversal) Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Other assets: Other Assets, Noncurrent [Abstract] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset, Total Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Consolidation Items [Axis] Consolidation Items [Axis] Fuel, purchased power and cost of natural gas sold Fuel, purchased power and cost of natural gas sold Fuel, Purchased Power and Cost of Gas Sold Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period, combined with the amount of purchased power charged against earnings for the period, and cost of gas sold to customers for the period. Services transferred over time Transferred over Time [Member] Other comprehensive income, net of tax Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Comprehensive income available for common stock Comprehensive Income (Loss), Net of Tax, Attributable to Parent Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Market - off-system sales Market Off-System Sales [Member] Market Off-System Sales [Member] Black Hills Energy, Kansas Gas Black Hills Energy, Kansas Gas [Member] Black Hills Energy, Kansas Gas Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Natural gas futures purchased Future [Member] Eurodollar [Member] Eurodollar Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total deferred credits and other liabilities Liabilities, Other than Long-Term Debt, Noncurrent Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Entity Interactive Data Current Entity Interactive Data Current Fuel, purchased power and cost of natural gas sold Cost of Sales [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Derivative [Table] Derivative [Table] Document Quarterly Report Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash, restricted cash and cash equivalents beginning of period Cash, restricted cash and cash equivalents end of period Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Statistical Measurement [Axis] Statistical Measurement [Axis] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period Environmental Remediation Site [Axis] Expected long-term rate of return on assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC. Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC. [Member] Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC. Assets, Fair Value Disclosure, Total Derivative Assets, Total Assets, Fair Value Disclosure Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Estimated Future Employer Contributions in Current Fiscal Year Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Effective Income Tax Rate Reconciliation, Tax Credit, from lower wind Tax Credits associated with higher wind production Commitments, Contingencies and Guarantees Commitments Contingencies and Guarantees [Text Block] Public Utilities, Requested Term Extension of System Safety and Integrity Rider Public Utilities, Requested Term Extension of System Safety and Integrity Rider Public Utilities, Requested Term Extension of System Safety and Integrity Rider Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Inter-segment Revenues Inter Segment Revenues [Member] Inter segment revenues. Commercial Paper Commercial Paper [Member] Other deferred credits and other liabilities Derivative Liabilities, Noncurrent Derivative Liabilities, Noncurrent [Member] Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included. Schedule of Unit Contingent Capacity Schedule of Unit Contingent Capacity [Table Text Block] [Table Text Block] for Schedule of Unit Contingent Capacity [Table] Derivative [Line Items] Derivative [Line Items] Payment for Pension Benefits Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Measurement Basis [Axis] Measurement Basis [Axis] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Short-Term Debt [Table] Total Assets TOTAL ASSETS Assets Public Utilities, Requested Return on Equity, Percentage Public Utilities, Requested Return on Equity, Percentage Public utilities, amount of requested system safety and integrity rider be moved to base rates and termination Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Management's Statement Schedule of Long-Term Debt Instruments [Table] Operations and maintenance Operating Expense, Maintenance, Operations, and Other Costs and Expense Amount of operating expenses for the period including selling, general, and administrative expenses, costs include routine repairs and maintenance and operations. Defined Benefit Plan Assumptions Used In Calculating Net Periodic Benefit Cost Expected Rate of Return On Assets For Next Fiscal Year Defined Benefit Plan Assumptions Used In Calculating Net Periodic Benefit Cost Expected Rate of Return On Assets For Next Fiscal Year An assumption for the next fiscal year as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation Natural gas options purchased, net Commodity Option [Member] Post-65 Ultimate trend rate - Black Hills Corp Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Entity Address, City or Town Entity Address, City or Town Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Segments [Axis] Segments [Axis] Iowa Utilities Board (IUB) Iowa Utilities Board (IUB) [Member] Iowa Utilities Board (IUB) Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Auditor Location Auditor Location Payments of Stock Issuance Costs Payments of Stock Issuance Costs Natural gas physical contracts, net Natural Gas Physical Purchases [Member] Natural Gas Physical Purchases [Member] Defined Contribution Plan, 401K Defined Contribution Plan, 401K [Member] The 401K defined contribution plan, which requires a contribution from the employee in order to receive a matching contribution (within limits) from the employer [Member] Defined Benefit Plan, Plan Assets, Amount Beginning fair value of plan assets Ending fair value of plan assets Defined Benefit Plan, Plan Assets, Amount Liability, Defined Benefit Plan, Noncurrent, Total Benefit plan liabilities Liability, Defined Benefit Plan, Noncurrent Settlement Reached with the Regulatory Agency Settlement Reached with the Regulatory Agency [Member] Settlement Reached with the Regulatory Agency Regulatory Asset [Axis] Regulatory Asset [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Schedule of Guarantor Obligations Schedule of Guarantor Obligations [Table Text Block] Public Utilities, Approved Debt Capital Structure, Percentage Public Utilities, Approved Debt Capital Structure, Percentage Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Arkansas Public Service Commission (APSC) Arkansas Public Service Commission (APSC) [Member] Arkansas Public Service Commission (APSC) Summary of ATM Activity Summary of At-the-Marke Activity [Table Text Block] Summary of at-the-marke activity. Interest expense incurred net of amounts capitalized Interest Costs Incurred, Total Interest expense Interest Costs Incurred Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Cost of removal Removal Costs [Member] Total other assets, non-current Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Northern Lowa Windpower Assets Northern Iowa Windpower Assets [Member] Northern lowa windpower assets. At the market equity offering program average price per share. At The Market Equity Offering Program Average Price Per Share Average price per share Issuance of common stock Stock Issued During Period, Value, New Issues Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification,Tax (Benefit) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Black Hills Energy - Wyoming Gas Black Hills Energy Wyoming Gas [Member] Black Hills Energy Wyoming Gas. Current liabilities: Liabilities, Current [Abstract] Distributions to non-controlling interests Payments to Noncontrolling Interests Income Taxes Paid, Net, Total Income Taxes Paid, Net Income taxes, net of transferred tax credits (Note 11) Cash Cash and Cash Equivalents [Member] Document Type Document Type Colorado Public Utilities Commission (CPUC) Colorado Public Utilities Commission (CPUC) [Member] Colorado Public Utilities Commission (CPUC) [Member] Other investing activities Other investing activities Payments for (Proceeds from) Other Investing Activities Energy Related Derivative Energy Related Derivative [Member] Storm Costs Storm Costs [Member] Hedge Funds Hedge Funds, Multi-strategy [Member] Title of 12(b) Security Title of 12(b) Security Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Defined Benefit Plan, Accumulated Benefit Obligation Defined Benefit Plan, Accumulated Benefit Obligation Statement of Stockholders' Equity [Abstract] Public Utilities, Approved Shift Rate Rider Rate to Base Rate Public Utilities Approved Shift Rate Rider Rate to Base Rate Public utilities approved shift rate rider rate to base rate. Document Fiscal Period Focus Document Fiscal Period Focus Long-term debt, net of current maturities Long-Term Debt, Excluding Current Maturities, Total Long-term debt, net of current maturities Long-Term Debt, Excluding Current Maturities Other regulatory liabilities Other Regulatory Liabilities [Member] Other regulatory liabilities [Member] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Kansas Corporation Commission (KCC) Kansas Corporation Commission (KCC) [Member] Kansas Corporation Commission (KCC) Dividends paid on common stock Payments of Dividends, Total Payments of Dividends Deferred taxes on AFUDC Allowance For Funds Used During Construction [Member] The offsetting entry to other income when an enterprise capitalizes, as part of the cost of plant and equipment, the cost of financing construction as financed partially by equity. Property, plant and equipment Property, Plant and Equipment, Gross, Total Total gross property, plant and equipment Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross Interest cost Defined Benefit Plan, Interest Cost Subsequent Event Type [Domain] Subsequent Event Type [Domain] Environmental Environmental [Member] Environmental costs associated with utility property [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Fair Value Fair Value Estimate of Fair Value Measurement [Member] Rate Review Filed with the Regulatory Agency Rate Review Filed with the Regulatory Agency [Member] Rate Review Filed with the Regulatory Agency [Member] Operating Segments [Member] Operating Segments Black Hills Service Company Black Hills Service Company [Member] Black Hills Service Company [Member] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Sale of Stock [Axis] Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Regulatory liabilities Regulatory liabilities Regulatory Liability Error Correction, Type [Domain] Error Correction, Type [Domain] Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Black Hills Energy - Arkansas Gas Black Hills Energy, Arkansas Gas [Member] Black Hills Energy, Arkansas Gas Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Income Taxes Income Tax Disclosure [Text Block] Schedule of Short-term Debt Schedule of Short-Term Debt [Table Text Block] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Line of Credit Facility [Line Items] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Credit Facility [Domain] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Depreciation, Depletion and Amortization, Nonproduction, Total Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Other (none of which is individually significant) Other Accrued Liabilities, Current Derivative, Gain on Derivative Other financing activities Proceeds from (Payments for) Other Financing Activities LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Document Period End Date Document Period End Date Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Effective Income Tax Rate Reconciliation, Percent, Total Effective Income Tax Rate Reconciliation, Percent Effective Tax Rate Interest Rate Swap and Commodity Derivative Interest Rate Swap and Commodity Derivative [Member] Interest Rate Swap and Commodity Derivative Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Deferred credits and other liabilities: Liabilities, Noncurrent [Abstract] Anti-dilutive shares excluded from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Carrying Amount Reported Value Measurement [Member] Extension period. Extension Period Extension period as per settlement agreement Accrued liabilities Total accrued liabilities Accrued Liabilities, Current Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Derivative liabilities, current Derivative Liability, Current Transmission/Other Transmission/Other [Member] Transmission/Other [Member] Income tax (expense) Income tax expense Income tax (expense) Total Current and Deferred Income Tax Expense (Benefit) Dividends on common stock Dividends, Common Stock, Cash Trading Symbol Trading Symbol Variable Rate [Axis] Total stockholders’ equity Stockholders' Equity Attributable to Parent, Beginning Balance Stockholders' Equity Attributable to Parent, Ending Balance Equity, Attributable to Parent 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Income tax receivable, net Income Taxes Receivable, Current Public Utilities Weighted average cost of capital percentage Public Utilities Weighted Average Cost of Capital Percentage Weighted Average Cost of Capital Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Other deferred credits and other liabilities Other Liabilities, Noncurrent Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] State income tax expense (benefit) State and Local Income Tax Expense (Benefit), Continuing Operations State and Local Income Tax Expense (Benefit), Continuing Operations, Total Common Collective Trust - Equity Common Collective Trust, Equity Fund Common Collective Trust, Equity Fund [Member] Common Collective Trust, Equity Fund [Member] Post-65 for next year - All Plans Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Electric Utilities Electric Utilities [Member] Electric Utilities Segment [Member] Goodwill, Total Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Goodwill Debt, Weighted Average Interest Rate Weighted average interest rates Loss on reacquired debt Bond Issuance Costs [Member] Utility Bond Issuance Costs recoverable over the life of the original issue, or if refinanced, over the life of the new issue[Member] Defined Contribution Plan, Employer Discretionary Contribution Amount Defined Contribution Plan, Employer Discretionary Contribution Amount Accounts Receivable and Allowance for Doubtful Accounts Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Account Receivable Schedule Deferred income taxes Total Deferred Deferred Income Tax Expense (Benefit) Income tax disclosure. Income Tax Disclosure [Line Items] Geographical [Axis] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Use of Estimates and Basis of Presentation Use of Estimates, Policy [Policy Text Block] Proceeds from Issuance of Long-Term Debt, Total Long-term debt - issuance Proceeds from Issuance of Long-Term Debt Taxes, Miscellaneous, Total Taxes - property and production Taxes, Miscellaneous Natural gas in storage Energy Related Inventory, Natural Gas in Storage Income tax reconciliation due to sale of assets Income Tax Reconciliation Deductions From Sale Of Assets Income tax reconciliation deductions from sale of assets. Nebraska Publc Service Commission (NPSC) Nebraska Publc Service Commission (NPSC) [Member] Nebraska Publc Service Commission (NPSC) Scenario [Axis] Iowa Utilities Commission (IUC). Iowa Utilities Commission (I U C) [Member] Iowa Utilities Commission (IUC) Security Exchange Name Security Exchange Name Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax Total operating expenses Operating Expenses Unbilled Receivables, Current Unbilled Revenue Cash Flow Hedging Cash Flow Hedging [Member] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Energy [Axis] Energy [Axis] Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Legal Entity [Axis] Legal Entity [Axis] Regulatory Assets [Domain] Regulatory Asset [Domain] Subsequent Event Subsequent Event [Member] Maximum Maximum [Member] TOTAL LIABILITIES AND TOTAL EQUITY Liabilities and Equity 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year One Expected extension period. Expected Extension Period Expected extension period as per settlement agreement Long Long [Member] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Retirement Benefits [Abstract] Net income available for common stock, per share - Diluted Earnings Per Share, Diluted, Total Earnings per share, Diluted (usd per share) Earnings Per Share, Diluted Other assets, non-current Derivative Assets, Noncurrent Derivative Assets, Noncurrent [Member] Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included. Effective Income Tax Rate Reconciliation Prior Year Credit - Tax Cuts And Jobs Act Of 2017 Amount, Tax Benefit from Bill Credit Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Amount, Tax Benefit from Bill Credit Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Amount, Tax Benefit from Bill Credit Distributions to non-controlling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Accounts receivable and other current assets Increase (Decrease) in Accounts Receivable and Other Operating Assets Total current assets Current assets Assets, Current Net cash (used in) investing activities Net Cash Provided by (Used in) Investing Activities Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Effective income tax rate reconciliation taxcuts and jobsact of 2017 amount of decreased tax benefit. Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Amount of Decreased Tax Benefit Effective income tax rate reconciliation tax cuts and jobs act of 2017 amount of lower tax benefit Forecast [Member] Forecast Issuance of common stock (in shares) Stock Issued During Period, Shares, New Issues Entity Filer Category Entity Filer Category Deferred gas cost adjustments Asset Recoverable Gas Costs [Member] Natural Gas, Distribution Natural Gas, Distribution [Member] Natural Gas for distribution [Member] Gas supply contract termination Gas Supply Contract Termination [Member] Gas Supply Contract Termination [Member] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Regulatory assets, non-current Regulatory Asset, Noncurrent Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Schedule of Defined Benefit Plans Contributions Schedule of Defined Benefit Plans Contributions [Table Text Block] Schedule of Defined Benefit Plans Contributions for the current year and specific future years. Audit Information [Abstract] Audit Information [Abstract] Other income (expense): Nonoperating Income (Expense) [Abstract] Rate Review Approved by Regulatory Agency Rate Review Approved by Regulatory Agency [Member] Rate Review Approved by Regulatory Agency Current Fiscal Year End Date Current Fiscal Year End Date Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Restricted Cash and Investments, Current, Total Restricted cash and equivalents Restricted Cash and Investments, Current Noncontrolling Interest Noncontrolling Interest [Member] Recovery of incremental costs Regulatory assets Regulatory assets Regulatory Asset Black Hills Energy - Rocky Mountain Natural Gas Black Hills Energy, Rocky Mountain Natural Gas Black Hills Energy, Rocky Mountain Natural Gas [Member] Non-Rule 10b5-1 Arrangement Modified Non Rule 10b51 Arr Modified [Flag] Non rule 10b51 arr modified flag. Share-Based Payment Arrangement, Noncash Expense, Total Stock compensation Share-Based Payment Arrangement, Noncash Expense Selected Balance Sheet Information [Abstract] Selected Balance Sheet Information [Abstract] Selected Balance Sheet Information [Abstract] Commodity derivatives Commodity Contract Commodity Contract [Member] Public utilities amount of system safety and integrity rider moved to base rates and termination of the system safety and integrity rider. Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider Energy [Domain] Energy [Domain] Entity Registrant Name Entity Registrant Name Trend Year Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Public Utilities Number Of Former Riders Replaced With A New Comprehensive Safety And Integrity Rider Public utilities, number of former riders replaced with a new comprehensive safety and integrity rider. Derivative liabilities, current Derivative Liabilities, Current [Member] Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included. Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Other revenues Other [Member] Other [Member] Netting Contract by Category [Axis] Netting Contract, Category [Axis] Netting Contract by Category [Axis] Earnings Per Share [Text Block] Earnings Per Share Entity Emerging Growth Company Entity Emerging Growth Company Transaction [Domain] Transaction [Domain] Received Final Approval for a Settlement Agreement for a General Rate Increase Received Final Approval for a Settlement Agreement For A General Rate Increase [Member] Settlement agreement for a general rate increase. Line of Credit Facility, Interest Rate at Period End Weighted average interest rates Weighted average shares - Basic (in shares) Weighted Average Number of Shares Outstanding, Basic, Total Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Loss Contingencies [Line Items] Electricity Electricity [Member] Deferred taxes on flow through accounting Flow Through Accounting [Member] The income tax effects of certain tax items are reflected in cost of service for the customer in which the tax benefits are realized and result in lower utiity rates. The regulatory treatment under flow-through accounting was applied for this tax benefit generated by utility costs that were previously capitalized for tax purposes in a rate case settlement and resulted in a lower rate increase. A regulatory asset was established to reflect the future increase in taxes payable recovered from sutomers as the temporarty difference reverses.[Member] Common stock, shares authorized Common Stock, Shares Authorized Accrued interest Interest Payable, Current Credit Risk Derivative Liabilities, at Fair Value Collateral Already Posted, Aggregate Fair Value Other comprehensive income (loss), before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Common stock issued Proceeds from Issuance of Common Stock Regulatory assets Regulatory assets Increase (Decrease) in Other Regulatory Assets Derivative, Remaining Maturity Derivative, Remaining Maturity Debt instrument consolidated indebtedness to capitalization ratio requirement. 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Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Equity: Equity, Attributable to Parent [Abstract] Gas price derivatives Price Risk Derivative [Member] Remediation cost Remediation Cost Site remediation cost Inventory, Raw Materials and Supplies, Gross, Total Materials and supplies Inventory, Raw Materials and Supplies, Gross Retail - Electric , Natural Gas and Coal Retail - Electric , Natural Gas and Coal [Member] Retail - Electric , Natural Gas and Coal Statement [Table] Statement [Table] Common Collective Trust - Real Estate Real Estate Funds Real Estate Funds [Member] Public Utilities, Term Extension of System Safety and Integrity Rider Public Utilities, Term Extension of System Safety and Integrity Rider Public Utilities, Term Extension of System Safety and Integrity Rider Entity File Number Securities Act File Number Business Segment Information Segment Reporting Disclosure [Text Block] Amounts reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Earnings per share of common stock: Earnings Per Share [Abstract] Services transferred at a point in time Transferred at Point in Time [Member] Net unrealized gains (losses) on commodity derivatives (net of tax of $0.0, $0.1, $0.0, and $0.3, respectively) Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax, Total Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax Available borrowing capacity. Available Borrowing Capacity Available capacity Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Non-controlling interest Noncontrolling Interest in Variable Interest Entity Operating income Operating income Operating Income (Loss) Derivative Asset, Total Derivative Assets, Fair Value Disclosure Derivative Asset Corporate and Other Corporate, Non-Segment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Letter of Credit [Member] Letter of Credit Entity Shell Company Entity Shell Company 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Line of Credit Facility [Table] Settlement agreement reached with APSC Staff and various intervenors A P S C Authorized Member A P S C Aauthorized. Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Entity Tax Identification Number Entity Tax Identification Number ASSETS Assets [Abstract] Decommissioning costs Environmental Restoration Costs [Member] Entity Current Reporting Status Entity Current Reporting Status Income Tax Disclosure [Table] Income tax disclosure. Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Derivative assets, current Derivative Assets, Current [Member] Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included. Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral, Total Derivative Asset, Fair Value, Amount Not Offset Against Collateral Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Long-Term Debt, Type [Axis] Subsequent Events [Abstract] Geographical [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Return on Equity, Percentage Long-term Purchase Commitment Long-Term Purchase Commitment [Table Text Block] Black Hills Energy - Colorado Gas Black Hills Energy, Colorado Gas [Member] Black Hills Energy, Colorado Gas [Member] Long-term debt - repayments Repayments of Long-Term Debt, Total Repayments of Long-Term Debt Repayment of long term debt Accrued property, plant and equipment purchases at September 30, Capital Expenditures Incurred but Not yet Paid Public utilities, requested debt capital structure, percentage Public Utilities, Requested Debt Capital Structure, Percentage Percentage Of Monthly Redemption Percentage Of Monthly Redemption Percentage of shares that may be redeemed at the end of each month. Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments Deferred energy and gas costs Deferred Energy and Gas Costs Member Deferred energy and gas costs. 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Debt Issuance Costs, Net, Total Debt Issuance Costs, Net Less unamortized deferred financing costs Natural gas basis swaps purchased Basis Swap [Member] Debt Instrument, Interest Rate, Stated Percentage Stated interest rate (percent) Retained Earnings Retained Earnings [Member] Amortization of Debt Issuance Costs and Discounts, Total Deferred financing cost amortization Amortization of Debt Issuance Costs and Discounts Property, plant and equipment additions Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Property, Plant, and Equipment Regulatory liabilities, non-current Regulatory Liability, Noncurrent Document Transition Report Document Transition Report Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Public Utilities, Approved Equity Capital Structure, Percentage Public Utilities, Approved Equity Capital Structure, Percentage Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Auditor Firm ID Auditor Firm ID Minimum Minimum [Member] Common Stock Common Stock [Member] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Segment Reporting Information, Additional Information [Abstract] Segment Reporting Information, Additional Information [Abstract] Additional Paid-in Capital Additional Paid-in Capital [Member] Line of Credit Facility, Maximum Amount Outstanding During Period Maximum amount outstanding (based on daily outstanding balances) Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion Senior Unsecured Notes Due 2024 Senior Unsecured Notes Due 2024 [Member] Senior Unsecured Notes Due 2024 Defined Benefit Pension Plans Pension Plan Pension Plan [Member] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Accounts Receivable, before Allowance for Credit Loss, Current Less: Allowance for Credit Losses Billed Accounts Receivable Other assets, non-current Other Assets, Noncurrent Financing Receivable, Current, Allowance for Credit Loss Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] Financing Receivable, Current, Allowance for Credit Loss Accrued property taxes Accrual for Taxes Other than Income Taxes, Current Reporting Segment [Domain] Segments [Domain] Segments [Domain] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Materials, Supplies and Fuel Schedule of Inventory, Current [Table Text Block] Natural Gas Natural Gas [Member] Other current assets Other Assets, Current Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] Black Hills Corporation Black Hills Corporation [Member] Black Hills Corporation [Member] Position [Domain] Scenario [Domain] Issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset, Total Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset August 4, 2020 ATM Program August Four Twenty Twenty ATM Program [Member] August 4, 2020 ATM program. Common stock $1 par value; 100,000,000 shares authorized; issued 71,676,746 and 68,265,042 shares, respectively Common Stock, Value, Issued Interest income Investment Income, Interest Excess deferred income taxes Deferred Income Tax Amortization [Member] Rate Action of a regulator resulting in return of prior period income tax over collections Measurement Frequency [Axis] Measurement Frequency [Axis] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Commitments, contingencies and guarantees (Note 3) Commitments and Contingencies Capital expenditures Property, Plant and Equipment, Gross, Period Increase (Decrease) Property, Plant and Equipment, Gross, Period Increase (Decrease), Total Derivative, Loss on Derivative Derivative, Loss on Derivative Wyoming Public Service Commission Wyoming Public Service Commission [Member] Wyoming Public Service Commission Weighted average shares - diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Natural gas over-the-counter swaps, net Fixed for Float Swaps Purchased [Member] Fixed for Float Swaps Purchased [Member] Segment information included in Consolidated Statements of Income Schedule of Segment Reporting Information, by Segment [Table Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current, Total Account Receivable, net Materials, supplies and fuel Increase (Decrease) in Inventories, Total Increase (Decrease) in Inventories Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Power purchased Power Purchased [Member] Power Purchased [Member] Employee benefit plans and related deferred taxes Employee Benefit Plans And Related Deferred Taxes Assets [Member] Employee Benefit Plans And Related Deferred Taxes Assets [Member] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Segment Reporting Information Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Derivative, Nonmonetary Notional Amount Derivative, Nonmonetary Notional Amount Financing Debt Disclosure [Text Block] Derivative Instrument, Loss Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] (Tax) benefit on reclassification adjustment of benefit plan liability - net loss Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax, Total Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Revenues, Total Revenue Revenues Manufactured Gas Plant Manufactured Gas Plant [Member] Manufactured Gas Plant [Member] Derivative, Liabilities, Fair Value Disclosure Derivative Liability, Total Derivative Liability Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Credit Facility [Axis] Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Revolving Credit Facility [Member] Revolving Credit Facility Contract or notional amounts and terms of marketing activities and derivative commodity instruments Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Employer Contribution to Employee Benefit Plans Schedule of Employer Contribution to Employee Benefit Plans [Table Text Block] Schedule of Employer Contribution to Defined Benefit and Defined Contribution Plans [Table Text Block] Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Dilutive effect of equity compensation Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Regulatory Asset, Amortization Period Regulatory Asset, Amortization Period Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Unrealized Gain (Loss) on Cash Flow Hedging Instruments 2027-2031 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Intangible Assets, Net (Excluding Goodwill), Total Intangible assets, net Intangible assets, net, beginning balance Intangible assets, net, ending balance Intangible Assets, Net (Excluding Goodwill) Measurement Frequency [Domain] Measurement Frequency [Domain] Accumulated Defined Benefit Plans Adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Postretirement Health Coverage Postretirement Health Coverage [Member] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Subsequent Events Subsequent Events [Text Block] Equity Compensation Share-Based Payment Arrangement [Member] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Liabilities, Fair Value Disclosure, Total Derivative Liabilities, Total Liabilities, Fair Value Disclosure Accounts Receivable, Allowance for Credit Loss, Current Less: Allowance for Credit Losses Balance at Beginning of Year Balance at End of Year Less: Allowance for Credit Losses Black Hills Energy - Nebraska Gas Black Hills Energy - Nebraska Gas [Member] Black Hills Energy - Nebraska Gas [Member]