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Income Taxes (Income Tax Reconciliation and Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]          
Income before income taxes and equity in net income (loss) of unconsolidated entities $ 63.2 $ 92.5 $ 176.3 $ 189.6  
Equity in net income (loss) of unconsolidated entities 1.9 0.6 4.6 (0.7)  
Total 65.1 93.1 180.9 188.9  
Income tax expense $ 16.1 $ 16.9 $ 44.1 $ 40.6  
Effective income tax rate 24.70% 18.20% 24.40% 21.50%  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]          
Current liability $ 7.1   $ 7.1   $ 7.6
Non-current liability 5.0   5.0   5.1
Total liability for unrecognized tax benefits $ 12.1   $ 12.1   $ 12.7
Concentration Risk [Line Items]          
Effective Income Tax Rate Reconciliation, Increase (Decrease) From Prior Year, PercentTaxes 6.50%   2.90%    
Geographic Concentration Risk | Cash, Cash Equivalents and Investments | Total International          
Concentration Risk [Line Items]          
Percentage of cash, cash equivalents and investments held by operations outside of US     66.00%