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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 8.7 $ 12.7 $ 20.0 $ 25.6
Restricted Stock Units [Member]        
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 8.7 11.3 19.5 21.9
Equity Option [Member]        
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 0.0 $ 1.4 $ 0.5 $ 3.7