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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ 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
Share based compensation expense, net of tax 15.8 10.8 $ 49.3 42.5
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 $ 4.5 $ 2.2 $ 13.4 $ 14.0
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     100,199 175,164
Weighted average fair value per award, in dollars per share     $ 276.87 $ 177.04
Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     249,579 390,905
Weighted average fair value per award, in dollars per share     $ 76.85 $ 46.72
Phantom Share Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     161,782 207,086
Weighted average fair value per award, in dollars per share     $ 332.65 $ 207.12