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Stock-Based Compensation Fair Value Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Volatility 25.60% 23.30% 22.70%
Risk Free Interest Rate 1.40% 1.30% 1.00%
Expected Term 3 years 3 years 3 years
Stock Price on Measurement Date (USD per share) $ 113.69 $ 97.48 $ 106.44
Weighted average fair vale (USD per share) $ 105.48 $ 97.48 $ 106.44
Stock Appreciation Rights SARS      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Dividend Yield 2.60% 2.70% 2.00%
Expected Volatility 22.30% 22.70% 21.80%
Risk Free Interest Rate 1.90% 1.70% 1.60%
Expected Term 5 years 6 months 5 years 6 months 5 years 3 months 18 days
Weighted Avg. Grant Date Fair Value of 1 SAR (USD per share) $ 18.76 $ 16.05 $ 18.42
Weighted average fair vale (USD per share) $ 113.48    
Performance Shares - Market Condition      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Dividend Yield 2.50% 2.60% 2.10%
Expected Volatility 25.60% 23.30% 22.70%
Risk Free Interest Rate 1.40% 1.30% 1.00%
Expected Term 3 years 3 years 3 years
Stock Price on Measurement Date (USD per share) $ 113.69 $ 97.48 $ 106.44
Weighted average fair vale (USD per share) $ 126.65 $ 105.77 $ 117.55