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Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share based compensation expense $ 20.9 $ 14.3 $ 65.1 $ 56.2
Tax benefit (5.1) (3.5) (15.8) (13.7)
After-tax expense (15.8) (10.8) (49.3) (42.5)
Stock Options [Member]        
Share based compensation expense 4.5 2.2 13.4 14.0
Restricted Stock Units (RSUs) [Member]        
Share based compensation expense 6.4 3.4 21.0 20.0
Phantom Share Units (PSUs) [Member]        
Share based compensation expense 9.1 7.5 28.2 18.8
Deferred Compensation [Member]        
Share based compensation expense $ 0.9 $ 1.2 $ 2.5 $ 3.4