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Goodwill and Intangibles - Intangible Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Period of amortization | 5 years |
Operating revenues |  |
Amortization to be recorded in the next five years |  |
2022 | $ 8.5 |
2023 | 8.4 |
2024 | 8.4 |
2025 | 8.4 |
2026 | 8.4 |
Other operation and maintenance |  |
Amortization to be recorded in the next five years |  |
2022 | 0.2 |
2023 | 0.2 |
2024 | 0.2 |
2025 | 0.2 |
2026 | 0.2 |
WECI |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 99.8 | $ 88.4
Accumulated Amortization | (9.1) | (1.6)
Net Carrying Amount | 90.7 | 86.8
WECI | PPAs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 87.9 | 76.1
Accumulated Amortization | (6.5) | 0.0
Net Carrying Amount | 81.4 | 76.1
WECI | Proxy revenue swap |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7.2 | 7.2
Accumulated Amortization | (2.1) | (1.3)
Net Carrying Amount | 5.1 | 5.9
WECI | Interconnection agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4.7 | 5.1
Accumulated Amortization | (0.5) | (0.3)
Net Carrying Amount | $ 4.2 | $ 4.8
Blooming Grove Wind Energy Center LLC, Tatanka Ridge Wind, LLC, and Jayhawk Wind, LLC | PPAs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average useful life | 11 years |
Upstream Wind Energy LLC | Proxy revenue swap |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average useful life | 7 years |
Length of proxy revenue contract, in years | 10 years |
Tatanka Ridge Wind LLC and Bishop Hill Energy III LLC | Interconnection agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average useful life | 19 years |

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