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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share based compensation expense $ 22.0 $ 20.1
Share based compensation expense, net of tax $ 16.7 15.2
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 $ 5.3 $ 4.1
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 96,323 86,199
Weighted average fair value per award, in dollars per share $ 355.49 $ 270.23
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 241,425 245,241
Weighted average fair value per award, in dollars per share $ 101.70 $ 76.72
Phantom Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 134,280 158,320
Weighted average fair value per award, in dollars per share $ 373.86 $ 331.85