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Goodwill and Intangibles - Intangible Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Finite-Lived Intangible Liabilities |  |  |
Amortization | $ 53.7 | $ 50.6 | $ 11.3
Period of amortization | 5 years |  |
Amortization to be recorded as an increase to operating revenues |  |  |
Amortization to be recorded in the next five years |  |  |
2025 | $ 53.9 |  |
2026 | 55.1 |  |
2027 | 55.1 |  |
2028 | 55.1 |  |
2029 | 55.1 |  |
Amortization to be recorded as a decrease to other operation and maintenance |  |  |
Amortization to be recorded in the next five years |  |  |
2025 | 0.2 |  |
2026 | 0.2 |  |
2027 | 0.2 |  |
2028 | 0.2 |  |
2029 | 0.2 |  |
WECI |  |  |
Finite-Lived Intangible Liabilities |  |  |
Gross carrying amount | 691.5 | 665.8 |
Accumulated Amortization | (124.7) | (71.0) |
Net Carrying Amount | 566.8 | 594.8 |
PPAs | WECI |  |  |
Finite-Lived Intangible Liabilities |  |  |
Gross carrying amount | 679.6 | 653.9 |
Accumulated Amortization | (119.3) | (66.6) |
Net Carrying Amount | $ 560.3 | 587.3 |
PPAs | Blooming Grove Wind Energy Center LLC, Tatanka Ridge Wind, LLC, Jayhawk Renewables, LLC, Thunderhead Wind LLC, Samson I Solar Energy Center LLC, Sapphire Sky Wind Energy LLCSky |  |  |
Finite-Lived Intangible Liabilities |  |  |
Weighted average useful life | 11 years |  |
Proxy revenue swap | WECI |  |  |
Finite-Lived Intangible Liabilities |  |  |
Gross carrying amount | $ 7.2 | 7.2 |
Accumulated Amortization | (4.2) | (3.5) |
Net Carrying Amount | $ 3.0 | 3.7 |
Proxy revenue swap | Upstream Wind Energy LLC |  |  |
Finite-Lived Intangible Liabilities |  |  |
Weighted average useful life | 4 years |  |
Length of proxy revenue contract, in years | 10 years |  |
Interconnection agreements | WECI |  |  |
Finite-Lived Intangible Liabilities |  |  |
Gross carrying amount | $ 4.7 | 4.7 |
Accumulated Amortization | (1.2) | (0.9) |
Net Carrying Amount | $ 3.5 | $ 3.8 |
Interconnection agreements | Tatanka Ridge Wind LLC and Bishop Hill Energy III LLC |  |  |
Finite-Lived Intangible Liabilities |  |  |
Weighted average useful life | 16 years |  |

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