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Income Taxes (Deferred Tax Valuation Allowance) (Details) - Valuation Allowance of Deferred Tax Assets - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Movement in Deferred Tax Valuation Allowances [Roll Forward]      
Balance at beginning of year $ 43.1 $ 43.7 $ 43.8
Additions charged to provision for income taxes 3.3 1.9 0.4
Deferred tax assets realized or written-off 0.3 (6.4) 0.1
Other, net 1.9 3.9 (0.6)
Balance at end of year $ 48.6 $ 43.1 $ 43.7