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Goodwill and Intangibles - Finite-lived Intangible Asset (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Amortization to be recorded as a decrease 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
Maple Flats | Amortization to be recorded as a decrease to operating revenues |
Amortization to be recorded in the next five years |
2025 | 0.9
2026 | 0.9
2027 | 0.9
2028 | 0.9
2029 | 0.9
PPAs | Maple Flats |
Finite-Lived Intangible Asset |
Gross carrying amount | $ 13.0
Weighted average useful life | 15 years

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