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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Service-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 599 468  
Granted (in shares) 385 298  
Vested (in shares) (204) (112)  
Forfeited (in shares) (52) (55)  
Ending balance (in shares) 728 599 468
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 107.26 $ 137.53  
Granted (in dollars per share) 81.51 70.55 $ 113.26
Vested (in dollars per share) 121.10 128.86  
Forfeited (in dollars per share) 107.31 120.97  
Ending balance (in dollars per share) $ 89.47 $ 107.26 $ 137.53
Weighted- Average Remaining Term in Years 1 year 4 months 24 days 1 year 6 months  
Aggregate Intrinsic Value $ 28.2 $ 52.2  
Performance-based Restricted Share Units      
Number of Non-vested Service- Based Share Units      
Beginning balance (in shares) 303 177  
Granted (in shares) 207 191  
Vested (in shares) (13) (27)  
Forfeited (in shares) (55) (38)  
Ending balance (in shares) 442 303 177
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 93.65 $ 138.29  
Granted (in dollars per share) 85.01 70.34 $ 126.37
Vested (in dollars per share) 176.59 142.18  
Forfeited (in dollars per share) 85.94 130.34  
Ending balance (in dollars per share) $ 86.61 $ 93.65 $ 138.29
Weighted- Average Remaining Term in Years 1 year 6 months 2 years  
Aggregate Intrinsic Value $ 17.2 $ 26.5