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Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share based compensation expense $ 24.1 $ 16.9 $ 44.2 $ 41.9
Tax benefit (5.8) (4.1) (10.7) (10.2)
After-tax expense (18.3) (12.8) (33.5) (31.7)
Stock Options [Member]        
Share based compensation expense 4.8 2.8 8.9 11.8
Restricted Stock Units (RSUs) [Member]        
Share based compensation expense 8.8 6.0 14.6 16.6
Phantom Share Units (PSUs) [Member]        
Share based compensation expense 9.6 6.9 19.1 11.3
Deferred Compensation [Member]        
Share based compensation expense $ 0.9 $ 1.2 $ 1.6 $ 2.2