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Income Taxes (Summary of Valuation Allowance) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Other Comprehensive Income (Loss), Net of Tax $ 95.0 $ (31.3) $ 39.5
Deferred tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 47.3 47.4 181.0
Acquired Businesses 0.0 0.0 0.4
Charged (Credited) to Costs and Expenses 116.5 0.7 (130.8)
Deductions (16.7) 0.0 0.0
Foreign Currency Translation 2.7 (0.8) (3.2)
Balance at End of Period 149.8 47.3 47.4
Other Comprehensive Income (Loss), Net of Tax $ 0.0 $ 0.0 $ 0.0