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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share based compensation expense $ 13.2 $ 22.5 $ 44.7 $ 53.3
Share based compensation expense, net of tax 10.0 17.0 $ 33.9 40.3
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 $ 2.8 $ 5.7 $ 14.6 $ 18.0
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     262,793 317,073
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     1,271,326 1,524,625