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Share-Based Incentive Plan (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 6,797,160   6,347,709
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 $ 78.9    
Weighted-average period over which total unrecognized compensation expense expected to be recognized, in years 1 year 6 months    
Intrinsic value of stock-based awards exercised and restricted stock units converted $ 19.1 $ 37.9  
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 3 months 18 days    
Average remaining contractual term for stock awards vested and expected to vest, in years 5 years 2 months 12 days    
Average remaining contractual term for stock awards exercisable, in years 4 years 2 months 12 days    
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