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Stock-Based Compensation - Fair Value Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Price on Measurement Date (USD per share) $ 127.51 $ 113.69 $ 97.48  
Expected Volatility 24.70% 25.60% 23.30%  
Risk Free Interest Rate 1.90% 1.40% 1.30%  
Expected Term 3 years 3 years 3 years  
Weighted average fair value (USD per share) $ 118.55 $ 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% 2.60% 2.70%  
Expected Volatility 18.00% 22.30% 22.70%  
Risk Free Interest Rate 2.20% 1.90% 1.70%  
Expected Term 5 years 6 months 5 years 6 months 5 years 6 months  
Weighted Avg. Grant Date Fair Value of 1 SAR (USD per share) $ 17.45 $ 18.76 $ 16.05  
Weighted average fair value (USD per share) 127.28      
Performance Shares - Market Condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Price on Measurement Date (USD per share) $ 127.51 $ 113.69 $ 97.48  
Expected Dividend Yield 2.40% 2.50% 2.60%  
Expected Volatility 24.70% 25.60% 23.30%  
Risk Free Interest Rate 1.90% 1.40% 1.30%  
Expected Term 3 years 3 years 3 years  
Weighted average fair value (USD per share) $ 142.89 $ 126.65 $ 105.77