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Stock-Based Compensation - Fair Value Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Price on Measurement Date (USD per share)   $ 127.51 $ 113.69
Expected Volatility   24.70% 25.60%
Risk Free Interest Rate   1.90% 1.40%
Expected Term   3 years 3 years
Stock Appreciation Rights SARS      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Dividend Yield 2.90% 2.60% 2.60%
Expected Volatility 21.70% 18.00% 22.30%
Risk Free Interest Rate 2.80% 2.20% 1.90%
Expected Term 5 years 6 months 5 years 6 months 5 years 6 months
Weighted Avg. Grant Date Fair Value of 1 SAR $ 18.23 $ 17.45 $ 18.76
Granted (USD per share) $ 107.23    
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
Expected Dividend Yield   2.40% 2.50%
Expected Volatility   24.70% 25.60%
Risk Free Interest Rate   1.90% 1.40%
Expected Term   3 years 3 years
Granted (USD per share)   $ 142.89 $ 126.65