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Other Income, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Income and Expenses [Abstract] |  |  |
Non-service components of net periodic benefit costs | Other income, net | Other income, net | Other income, net
Non-service components of net periodic benefit costs | $ 83.7 | $ 97.7 | $ 104.4
AFUDC - Equity | 59.8 | 59.1 | 29.4
Interest income | 17.2 | 3.9 | 1.2
Gains (losses) from investments held in rabbi trust | 11.7 | 13.7 | (12.6)
Other, net | 1.1 | 4.4 | (2.9)
Other income, net | 178.2 | 177.7 | 128.8
Equity method investments excluding transmission affiliates |  |  |
Earnings (loss) from equity method investment | $ 4.7 | $ (1.1) | $ 9.3

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