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Share-Based Compensation - STAP awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based awards activity      
Granted (in shares) 0    
Share-based Payment Arrangement, Tranche One      
Awards granted      
Share-based awards, vesting rights percentage 25.00%    
Share-based Payment Arrangement, Tranche Two      
Awards granted      
Share-based awards, vesting rights percentage 25.00%    
Share-based Payment Arrangement, Tranche Three      
Awards granted      
Share-based awards, vesting rights percentage 25.00%    
Share-based Payment Arrangement, Tranche Four      
Awards granted      
Share-based awards, vesting rights percentage 25.00%    
STAP awards      
Awards granted      
Grant expiration period from the grant date 10 years    
Share-based awards, vesting period 4 years    
Aggregate STAP liability $ 102.4 $ 96.8  
Weighted-average assumptions used to measure the fair value of the outstanding STAP awards:      
Expected term of awards (in years) 1 year 3 months 18 days 1 year 8 months 12 days 2 years
Expected volatility 30.00% 34.80% 29.10%
Risk-free interest rate (as a percent) 0.40% 0.10% 1.60%
Expected dividend yield (as a percent) 0.00% 0.00% 0.00%
Closing price of common stock (in dollars per share) $ 216.08 $ 151.79 $ 88.08
Share-based awards activity      
Outstanding at beginning of year (in shares) 2,121,860    
Exercised (in shares) (1,027,738)    
Forfeited/cancelled (in shares) (562)    
Outstanding at end of year (in shares) 1,093,560 2,121,860  
Exercisable at end of year 1,083,560    
Unvested at end of year 10,000    
Share awards, Weighted-Average Exercise Price      
Outstanding at beginning of year $ 118.48    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 112.72    
Forfeited (in dollars per share) 145.30    
Outstanding at end of year 123.89 $ 118.48  
Exercisable at end of year 124.55    
Unvested at end of year $ 52.57    
Share awards, Weighted Average Remaining Contractual Term (in Years)      
Outstanding at end of year 2 years 6 months    
Exercisable at end of year 2 years 7 months 6 days    
Unvested at end of year 10 months 24 days    
Share awards, Aggregate Intrinsic Value      
Outstanding at end of year $ 100.8    
Exercisable at end of year 99.2    
Unvested at end of year $ 1.6