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Leases - Power Purchase Commitment (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($)
Whitewater | Wisconsin Electric Power Company & Wisconsin Public Service |  |
Leases |  |
Acquisition purchase price, expected | $ 72.7 |
Power purchase commitment |  |
Leases |  |
Power purchase contract period | 25 years |
Firm capacity from power purchase contract (in megawatts) | MW | 236.5 |
Minimum energy requirements over remaining term of power purchase contract (in megawatts) | MW | 0 |
Finance lease obligation | $ 78.4 | $ 12.1
Finance lease obligation at end of life of power purchase contract | $ 0.0 |

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