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Income Taxes (Income Tax Reconciliation and Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income before income taxes and equity in net income (loss) of unconsolidated entities $ 108.5 $ 87.0  
Equity in investments of unconsolidated entities (2.6) (1.5)  
Total 105.9 85.5  
Income tax expense $ 27.4 $ 21.3  
Effective income tax rate 25.90%    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Current liability $ 0.1   $ 0.1
Non-current liability 12.5   11.7
Total liability for unrecognized tax benefits $ 12.6   11.8
Concentration Risk [Line Items]      
Effective Income Tax Rate Reconciliation, Increase (Decrease) From Prior Year, PercentTaxes 1.00%    
Unrecognized Tax Benefits $ 11.8   11.1
Total Liability For Unrecognized Tax Benefits $ 12.6   11.8
Effective tax rate   24.9  
Undistributed Earnings of Foreign Subsidiaries not Permanently Reinvested     142.0
Deferred Tax Liabilities, Undistributed Foreign Earnings     $ 7.1
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 79.00%