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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ 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
Share based compensation expense, net of tax 18.3 12.8 $ 33.5 31.7
Percentage Of Awards Applied To Performance Condition     50.00%  
Percentage of Awards Applied to Market Condition     50.00%  
Stock options and Restricted Stock Units (RSUs) [Member]        
Vesting period, in years     3 years  
Share-based Payment Arrangement, Option [Member]        
Share based compensation expense $ 4.8 $ 2.8 $ 8.9 $ 11.8
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     98,948 173,364
Weighted average fair value per award, in dollars per share     $ 276.15 $ 176.82
Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     249,579 389,355
Weighted average fair value per award, in dollars per share     $ 76.85 $ 46.70
Phantom Share Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     161,030 206,018
Weighted average fair value per award, in dollars per share     $ 332.17 $ 207.07