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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost $ 0.1        
Share based compensation expense   $ 15.4 $ 13.4 $ 60.7 $ 58.1
Share based compensation expense, net of tax   11.7 10.1 $ 46.0 44.0
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   $ 2.6 $ 2.9 $ 15.7 $ 17.5
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       211,307 265,964
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 1,285,257