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Share-Based Compensation Plans - Terms and Assumptions (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted-average assumptions used to estimate fair value:      
Dividends (in dollars per share) $ 0.40 $ 0.40 $ 0.40
PSUs Granted in 2014      
Weighted-average assumptions used to estimate fair value:      
Vesting period 3 years 3 years 3 years
TSR PSU      
Weighted-average assumptions used to estimate fair value:      
Expected dividend yield 1.40%    
Expected stock price volatility 29.10%    
Risk-free interest rate 0.80%    
Contractual term in years 2 years 8 months 12 days    
Weighted-average fair value estimate at grant date $ 2.3    
Weighted-average fair value estimate per share (in dollars per share) $ 31.64    
Dividend yield 0.00%    
Performance-based Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period for achieving stock price hurdles 3 years    
Weighted-average assumptions used to estimate fair value:      
Expected dividend yield 1.30%    
Expected stock price volatility 30.90%    
Risk-free interest rate 1.10%    
Contractual term in years 4 years 6 months    
Weighted-average fair value estimate at grant date $ 3.5    
Weighted-average fair value estimate per share (in dollars per share) $ 6.01    
Vesting period 3 years    
Contractual term 6 years