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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Service-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 1,211 728  
Granted (in shares) 823 818  
Vested (in shares) (372) (269)  
Forfeited (in shares) (42) (66)  
Ending balance (in shares) 1,620 1,211 728
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 60.96 $ 89.47  
Granted (in dollars per share) 54.68 47.48 $ 81.51
Vested (in dollars per share) 69.64 95.09  
Forfeited (in dollars per share) 59.82 71.03  
Ending balance (in dollars per share) $ 55.82 $ 60.96 $ 89.47
Weighted- Average Remaining Term in Years 1 year 1 year 4 months 24 days  
Aggregate Intrinsic Value $ 72.5 $ 62.5  
Performance-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 653 442  
Granted (in shares) 291 298  
Vested (in shares) (184) (68)  
Forfeited (in shares) (9) (19)  
Ending balance (in shares) 751 653 442
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 61.44 $ 86.61  
Granted (in dollars per share) 55.08 47.54 $ 85.01
Vested (in dollars per share) 68.89 116.35  
Forfeited (in dollars per share) 70.60 72.83  
Ending balance (in dollars per share) $ 57.13 $ 61.44 $ 86.61
Weighted- Average Remaining Term in Years 1 year 4 months 24 days 1 year 6 months  
Aggregate Intrinsic Value $ 33.6 $ 33.7