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Other Income, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Income and Expenses [Abstract] |  |  |
AFUDC - Equity | $ 15.2 | $ 11.4 | $ 25.1
Non-service credit (cost) components of net periodic benefit costs | 26.0 | 9.1 | (14.2)
Gain on repurchase of notes | 0.0 | 0.0 | 23.6
Other, net | 29.1 | 53.2 | 32.1
Other income, net | $ 70.3 | $ 73.7 | $ 66.6

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