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Stock-Based Compensation - Weighted-Average Assumptions Used in Estimating the Fair Value of SARs (Details) - Stock Appreciation Rights SARS - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Dividend Yield 2.50% 2.70% 2.90%
Expected Volatility 23.50% 22.70% 21.70%
Risk Free Interest Rate 1.30% 1.80% 2.80%
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) $ 24.52 $ 21.25 $ 18.23