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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Service-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 728 599  
Granted (in shares) 818 385  
Vested (in shares) (269) (204)  
Forfeited (in shares) (66) (52)  
Ending balance (in shares) 1,211 728 599
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 89.47 $ 107.26  
Granted (in dollars per share) 47.48 81.51 $ 70.55
Vested (in dollars per share) 95.09 121.10  
Forfeited (in dollars per share) 71.03 107.31  
Ending balance (in dollars per share) $ 60.96 $ 89.47 $ 107.26
Weighted- Average Remaining Term in Years 1 year 4 months 24 days 1 year 4 months 24 days  
Aggregate Intrinsic Value $ 62.5 $ 28.2  
Performance-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 442 303  
Granted (in shares) 298 207  
Vested (in shares) (68) (13)  
Forfeited (in shares) (19) (55)  
Ending balance (in shares) 653 442 303
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 86.61 $ 93.65  
Granted (in dollars per share) 47.54 85.01 $ 70.34
Vested (in dollars per share) 116.35 176.59  
Forfeited (in dollars per share) 72.83 85.94  
Ending balance (in dollars per share) $ 61.44 $ 86.61 $ 93.65
Weighted- Average Remaining Term in Years 1 year 6 months 1 year 6 months  
Aggregate Intrinsic Value $ 33.7 $ 17.2