v3.24.1.u1
Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share based compensation expense $ 20.1 $ 25.0
Share based compensation expense, net of tax $ 15.2 18.9
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 $ 4.1 $ 9.0
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 86,199 159,272
Weighted average fair value per award, in dollars per share $ 270.23 $ 177.79
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 245,241 388,150
Weighted average fair value per award, in dollars per share $ 76.72 $ 46.71
Phantom Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 158,320 203,186
Weighted average fair value per award, in dollars per share $ 331.85 $ 207.41