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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share based compensation expense $ 14.3 $ 11.1 $ 56.2 $ 45.2
Share based compensation expense, net of tax 10.8 8.4 $ 42.5 34.3
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 $ 2.2 $ 2.1 $ 14.0 $ 12.3
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     175,164 135,625
Weighted average fair value per award, in dollars per share     $ 177.04 $ 165.32
Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     390,905 429,796
Weighted average fair value per award, in dollars per share     $ 46.72 $ 35.96
Phantom Share Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     207,086 192,826
Weighted average fair value per award, in dollars per share     $ 207.12 $ 170.30