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Share-Based Incentive Plan (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 7,083,218   6,815,278
Long-Term Incentive Plan 2003      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Ordinary shares reserved for issuance 55,300,000    
Total unrecognized compensation expense, net of estimated forfeitures $ 130.6    
Weighted-average period over which total unrecognized compensation expense expected to be recognized, in years 1 year 10 months 3 days    
Intrinsic value of stock-based awards exercised and restricted stock units converted $ 22.1 $ 38.1  
Long-Term Incentive Plan 2003 | Stock awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award expiration period, in years 10 years    
Average remaining contractual term for stock awards outstanding, in years 5 years 6 months 31 days    
Average remaining contractual term for stock awards vested and expected to vest, in years 5 years 5 months 23 days    
Average remaining contractual term for stock awards exercisable, in years 4 years 6 months 8 days    
Aggregate intrinsic value for stock awards outstanding $ 15.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 15.8    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 15.4    
Long-Term Incentive Plan 2003 | Stock awards | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years 3 years    
Long-Term Incentive Plan 2003 | Stock awards | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years 4 years    
One-Time Special Performance-Based Five-Year Realizable Value Incentive Program [Domain]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,600,000