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Share-Based Compensation - Restricted Stock Units Transactions (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Restricted Stock Units    
Unvested units - beginning balance (in shares) 1.1  
Units granted (in shares) 0.4  
Units vested (in shares) (0.3)  
Units forfeited (in shares) (0.0)  
Performance condition changes (in shares) 0.0  
Unvested units - ending balance (in shares) 1.2  
Weighted Average Grant Date Value    
Unvested units - beginning balance (in dollars per share) $ 95.03  
Units granted (in dollars per share) 129.45  
Units vested (in dollars per share) 108.92  
Units forfeited (in dollars per share) 94.04  
Performance condition changes (in dollars per share) 139.30  
Unvested units - ending balance (in dollars per share) $ 102.84  
Restricted stocks granted, fair value $ 45.3 $ 26.7
Minimum    
Weighted Average Grant Date Value    
Restricted stock, vesting period 3 years  
Maximum    
Weighted Average Grant Date Value    
Restricted stock, vesting period 4 years