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Non-operating income, net Non-Operating income, net (Components of Non-operating income, net) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Non-operating (loss) income, net [Abstract]      
Investment Income, Interest and Dividend $ 46.1 $ 14.9 $ 0.6
Loss on Extinguishment of Debt 0.0 0.0 2.1
Other Nonoperating Income (Expense) 5.1 (2.5) 0.2
Nonoperating Income (Expense) $ 51.2 $ 12.4 $ (1.3)