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Capital Stock and Equity Compensation (Equity Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense $ 0.8 $ 3.5 $ 8.7 $ 12.3
Performance-based restricted stock units expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense (0.7) 1.4 3.2 4.7
Time-based restricted stock units expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense 1.1 1.9 4.6 5.9
Deferred stock units expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense 0.4 0.0 0.6 1.3
Other        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense $ 0.0 $ 0.2 $ 0.3 $ 0.4