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Stock-based Compensation (PSU Assumptions and Fair Value) (Details) - Share Units Plan [Member] - Equity Settled Awards [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
PSU-ROIC [Member]      
Assumptions      
Stock price at grant date (in dollars per share) $ 125.82 $ 110.41 $ 97.77
Expected stock price volatility 17.00% 17.00% 18.00%
Expected term (years) 3 years 3 years 3 years
Risk-free interest rate 1.40% 1.75% 1.92%
Dividend rate (in dollars per share) $ 2.30 $ 2.15 $ 1.82
Weighted-average grant date fair value of units granted in period (in dollars per share) 73.92 70.76 50.77
PSU-TSR [Member]      
Assumptions      
Weighted-average grant date fair value of units granted in period (in dollars per share) $ 153.00 $ 128.20 $ 104.58