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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share based compensation expense $ 22.5 $ 19.1 $ 53.3 $ 43.9
Share based compensation expense, net of tax 17.0 11.8 $ 40.3 27.1
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 $ 5.7 $ 4.0 $ 18.0 $ 12.7
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     317,073 335,743
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     1,524,625 1,517,235