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Share-Based Payments Non-vested (Details) - $ / shares
shares in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
RSUs and DSUs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested awards outstanding at the beginning of the period (in shares) 0.8  
Granted (in shares) 0.3  
Vested (in shares) (0.3)  
Converted (in shares) 0.3  
Forfeited (in shares) 0.0  
Non-vested awards outstanding at the end of the period (in shares) 1.1  
Non-vested, weighted-average grant date fair value at the beginning of the period (in dollars per unit) $ 87.01  
Granted, weighted-average grant date fair value (in dollars per unit) 92.12  
Vested, weighted-average grant date fair value (in dollars per unit) 77.51  
Converted, weighted-average grant date fair value (in dollars per unit) 106.17  
Forfeited, weighted-average grant date fair value (in dollars per unit) 0.00  
Non-vested, weighted-average grant date fair value at the end of the period (in dollars per unit) $ 95.64  
PSUs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested awards outstanding at the beginning of the period (in shares) 0.5  
Granted (in shares) 0.2  
Vested (in shares) (0.2)  
Converted (in shares) (0.1)  
Forfeited (in shares) 0.0  
Non-vested awards outstanding at the end of the period (in shares) 0.4  
Non-vested, weighted-average grant date fair value at the beginning of the period (in dollars per unit) $ 81.67  
Granted, weighted-average grant date fair value (in dollars per unit) 97.13 $ 90.49
Vested, weighted-average grant date fair value (in dollars per unit) 57.46  
Converted, weighted-average grant date fair value (in dollars per unit) 106.17  
Forfeited, weighted-average grant date fair value (in dollars per unit) 0.00  
Non-vested, weighted-average grant date fair value at the end of the period (in dollars per unit) 89.53  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share $ 110.54