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Stock-Based Compensation Fair Value Assumptions (Details) - $ / shares
1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected Dividend Yield   2.60% 2.10%  
Expected Volatility   23.30% 22.70%  
Risk Free Interest Rate   1.30% 1.00%  
Expected Term   3 years 3 years  
Stock Price on Measurement Date (USD per share) $ 106.44 $ 97.48 $ 106.44  
Weighted average fair vale (USD per share) 97.48 $ 97.48 $ 106.44  
Stock Appreciation Rights SARS        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected Dividend Yield   2.70% 2.00% 1.90%
Expected Volatility   22.70% 21.80% 28.30%
Risk Free Interest Rate   1.70% 1.60% 1.60%
Expected Term   5 years 6 months 5 years 4 months 5 years 5 months
Weighted Avg. Grant Date Fair Value of 1 SAR (USD per share) 18.42 $ 16.05 $ 18.42 $ 24.58
Weighted average fair vale (USD per share)   $ 97.87    
Performance Shares - Market Condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected Dividend Yield   2.60% 2.10% 1.90%
Expected Volatility   23.30% 22.70% 33.80%
Risk Free Interest Rate   1.30% 1.00% 0.60%
Expected Term   3 years 3 years 3 years
Stock Price on Measurement Date (USD per share) $ 106.44 $ 97.48 $ 106.44 $ 107.87
Weighted average fair vale (USD per share)   $ 105.77 $ 117.55 $ 130.33