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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Total number of shares authorized by the shareholders 23,000,000    
Remains available for future incentive awards 11,400,000    
Share-based compensation expense $ (67.1) $ (55.7) $ (67.7)
Share-based compensation expense, net of tax (50.8) (42.2) (51.3)
Aggregate intrinsic value of options exercised, in USD $ 159.8 61.2  
Percentage Of Awards Applied To Performance Condition 50.00%    
Percentage of Awards Applied to Market Condition 50.00%    
Stock options and RSUs [Member]      
Vesting period, in years 3 years    
Stock Option [Member]      
Total unrecognized compensation cost from stock option arrangements granted under the plan, in USD $ 10.7    
Restricted Stock Units (RSUs) [Member]      
Share-based compensation expense (23.5) $ (19.7) $ (21.9)
Total unrecognized compensation cost from stock option arrangements granted under the plan, in USD $ 21.7    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 208,046,000,000 195,930,000,000 284,300,000,000
Share-based compensation expense $ (23.2) $ (20.7) $ (26.1)
Average fair value of stock options granted, in dollars per share $ 207,230,000 $ 170,310,000 $ 181,840,000
Total unrecognized compensation cost from stock option arrangements granted under the plan, in USD $ 20.0    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 425,444,000,000 430,496,000,000 589,417,000,000
Share-based compensation expense $ (16.1) $ (14.1) $ (16.7)
Average fair value of stock options granted, in dollars per share $ 47,530,000 $ 35,960,000 $ 29,620,000
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 214,425,000,000 139,730,000,000 153,806,000,000
Average fair value of stock options granted, in dollars per share $ 184,350,000 $ 165,070,000.00 $ 154,330,000