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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Non-operating (loss) income, net [Abstract]      
Loss on Extinguishment of Debt $ 0.0 $ 2.1 $ 0.0
Investment Income, Interest and Dividend 14.9 0.6 7.8
Gain (Loss) on Disposition of Business 0.0 0.0 6.4
income from transition services 0.0 0.0 2.1
Other Nonoperating Income (Expense) (2.5) 0.2 (0.1)
Nonoperating Income (Expense) $ 12.4 $ (1.3) $ 16.2