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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share based compensation expense $ 13.4 $ 14.3 $ 58.1 $ 67.6
Share based compensation expense, net of tax 10.1 10.8 $ 44.0 51.1
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  
Employee Stock Option [Member]        
Share based compensation expense $ 2.9 $ 3.1 $ 17.5 $ 21.1
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     265,964 317,073
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     1,285,257 1,524,625