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Share-Based Incentive Plan (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
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 6,408,680     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 $ 91.7      
Weighted-average period over which total unrecognized compensation expense expected to be recognized, in years 1 year 7 months 6 days      
Intrinsic value of stock-based awards exercised and restricted stock units converted $ 37.9 $ 42.8    
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      
Average remaining contractual term for stock awards vested and expected to vest, in years 5 years 4 months 24 days      
Average remaining contractual term for stock awards exercisable, in years 4 years 4 months 24 days      
Aggregate intrinsic value for stock awards outstanding $ 0.2      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 0.1      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 0.1      
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 1,100,000   2,600,000