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Goodwill and Intangibles - Intangible Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets |  |  |
Amortization | $ 50.6 | $ 11.3 | $ 7.5
Period of amortization | 5 years |  |
Amortization to be recorded as an increase to operating revenues |  |  |
Amortization to be recorded in the next five years |  |  |
2024 | $ 53.4 |  |
2025 | 53.4 |  |
2026 | 53.4 |  |
2027 | 53.4 |  |
2028 | 53.4 |  |
Amortization to be recorded as a decrease to other operation and maintenance |  |  |
Amortization to be recorded in the next five years |  |  |
2024 | 0.2 |  |
2025 | 0.2 |  |
2026 | 0.2 |  |
2027 | 0.2 |  |
2028 | 0.2 |  |
WECI |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 665.8 | 355.8 |
Accumulated Amortization | (71.0) | (20.4) |
Net Carrying Amount | 594.8 | 335.4 |
PPAs | WECI |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 653.9 | 343.9 |
Accumulated Amortization | (66.6) | (16.9) |
Net Carrying Amount | $ 587.3 | 327.0 |
PPAs | Blooming Grove Wind Energy Center LLC, Tatanka Ridge Wind, LLC, and Jayhawk Wind, LLC |  |  |
Finite-Lived Intangible Assets |  |  |
Weighted average useful life | 11 years |  |
Proxy revenue swap | WECI |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | $ 7.2 | 7.2 |
Accumulated Amortization | (3.5) | (2.8) |
Net Carrying Amount | $ 3.7 | 4.4 |
Proxy revenue swap | Upstream Wind Energy LLC |  |  |
Finite-Lived Intangible Assets |  |  |
Weighted average useful life | 5 years |  |
Length of proxy revenue contract, in years | 10 years |  |
Interconnection agreements | WECI |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | $ 4.7 | 4.7 |
Accumulated Amortization | (0.9) | (0.7) |
Net Carrying Amount | $ 3.8 | $ 4.0 |
Interconnection agreements | Tatanka Ridge Wind LLC and Bishop Hill Energy III LLC |  |  |
Finite-Lived Intangible Assets |  |  |
Weighted average useful life | 17 years |  |

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