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Other Income, Net (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 97.7 | $ 104.4 | $ 72.2
AFUDC - Equity | 59.1 | 29.4 | 18.0
Gains (losses) from investments held in rabbi trust | 13.7 | (12.6) | 18.6
Other, net | 8.3 | (1.7) | 4.5
Other income, net | 177.7 | 128.8 | 133.2
Equity method investments excluding transmission affiliates |  |  |
Earnings (Loss) from Equity Method Investment | $ (1.1) | $ 9.3 | $ 19.9

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