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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost $ 0.1  
Share based compensation expense 28.1 $ 31.5
Share based compensation expense, net of tax $ 21.3 23.9
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 $ 9.7 $ 11.8
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 189,546 242,104
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 1,020,535 1,259,344