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Commitment, Contingencies And Guarantees: Manufactured Gas Plant (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loss Contingencies [Line Items] |  |
Regulatory assets | $ 480.1 | $ 653.0
Environmental |  |
Loss Contingencies [Line Items] |  |
Regulatory assets | 2.9 | $ 1.3
Manufactured Gas Plant | Gas Utilities |  |
Loss Contingencies [Line Items] |  |
Insurance Settlements Receivable, Noncurrent | 1.4 |
Manufactured Gas Plant | Gas Utilities | Black Hills Energy - Iowa Gas |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies, Gross | 4.1 |
Manufactured Gas Plant | Gas Utilities | Black Hills Energy - Nebraska Gas |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies, Gross | 0.6 |
Manufactured Gas Plant | Gas Utilities | Environmental |  |
Loss Contingencies [Line Items] |  |
Regulatory assets | $ 2.7 |

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