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Stock-Based Compensation Plans (Schedule of Stock Based 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]        
Stock-based compensation expense $ 12.1 $ 10.7 $ 37.7 $ 32.2
Restricted Stock Units [Member]        
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 11.4 2.4 33.3 7.5
Equity Option [Member]        
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 0.7 $ 8.3 $ 4.4 $ 24.7