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Income Taxes (Income Tax Reconciliation and Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Effective Income Tax Rate Reconciliation, Amount [Abstract]          
Income before income taxes and equity in net income (loss) of unconsolidated entities $ 147.0 $ 116.5 $ 288.8 $ 225.0  
Equity in investments of unconsolidated entities (0.9) (1.2) (1.0) (3.8)  
Total 146.1 115.3 287.8 221.2  
Income tax expense $ 38.3 $ 26.3 $ 72.9 $ 53.7  
Effective income tax rate 26.20% 22.80% 25.30%    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]          
Total Liability For Unrecognized Tax Benefits $ 14.5   $ 14.5   $ 13.1
Concentration Risk [Line Items]          
Effective Income Tax Rate Reconciliation, Increase (Decrease) From Prior Year, PercentTaxes 3.40%   100.00%    
Unrecognized Tax Benefits $ 13.4   $ 13.4   12.3
Total Liability For Unrecognized Tax Benefits 14.5   14.5   $ 13.1
Effective tax rate       24.3  
Deferred Tax Liabilities, Undistributed Foreign Earnings 1.0   1.0    
Undistributed Earnings of Foreign Subsidiaries $ 84.0   $ 84.0    
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     85.00%   81.00%