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Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share based compensation expense $ 22.0 $ 20.1
Tax benefit (5.3) (4.9)
After-tax expense (16.7) (15.2)
Stock Options [Member]    
Share based compensation expense 5.3 4.1
Restricted Stock Units (RSUs) [Member]    
Share based compensation expense 6.3 5.8
Phantom Share Units (PSUs) [Member]    
Share based compensation expense 10.3 9.5
Deferred Compensation [Member]    
Share based compensation expense $ 0.1 $ 0.7