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Stock-Based Compensation - Fair Value Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Shares - Market Condition      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Price     $ 127.51
Expected Dividend Yield     2.40%
Expected Volatility     24.70%
Risk Free Interest Rate     1.90%
Expected Term     3 years
Granted (USD per share)     $ 142.89
Stock Appreciation Rights SARS      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Dividend Yield 2.70% 2.90% 2.60%
Expected Volatility 22.70% 21.70% 18.00%
Risk Free Interest Rate 1.80% 2.80% 2.20%
Expected Term 5 years 6 months 5 years 6 months 5 years 6 months
Weighted Avg. Grant Date Fair Value of 1 SAR $ 21.25 $ 18.23 $ 17.45
Granted (USD per share) $ 129.28