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Share-Based Compensation Plans - Restricted Stock Unit Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Service-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 1,620 1,211  
Granted (in shares) 1,197 823  
Vested (in shares) (782) (372)  
Forfeited (in shares) (101) (42)  
Ending balance (in shares) 1,934 1,620 1,211
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 55.82 $ 60.96  
Granted (in dollars per share) 41.36 54.68 $ 47.48
Vested (in dollars per share) 60.43 69.64  
Forfeited (in dollars per share) 46.32 59.82  
Ending balance (in dollars per share) $ 45.52 $ 55.82 $ 60.96
Weighted- Average Remaining Term in Years 9 months 18 days 1 year  
Aggregate Intrinsic Value $ 75.2 $ 72.5  
Performance-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 751 653  
Granted (in shares) 381 291  
Vested (in shares) (188) (184)  
Forfeited (in shares) (26) (9)  
Ending balance (in shares) 918 751 653
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 57.13 $ 61.44  
Granted (in dollars per share) 41.04 55.08 $ 47.54
Vested (in dollars per share) 75.58 68.89  
Forfeited (in dollars per share) 47.74 70.60  
Ending balance (in dollars per share) $ 47.10 $ 57.13 $ 61.44
Weighted- Average Remaining Term in Years 1 year 2 months 12 days 1 year 4 months 24 days  
Aggregate Intrinsic Value $ 35.7 $ 33.6