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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, 2021
Dec. 31, 2020
Dec. 31, 2019
PSU-ROIC [Member]      
Assumptions      
Stock price at grant date (in dollars per share) $ 133.36 $ 125.82 $ 110.41
Expected stock price volatility 24.00% 17.00% 17.00%
Expected term (years) 3 years 3 years 3 years
Risk-free interest rate 0.19% 1.40% 1.75%
Dividend rate (in dollars per share) $ 2.46 $ 2.30 $ 2.15
Weighted-average grant date fair value of units granted in period (in dollars per share) 64.50 73.92 70.76
PSU-TSR [Member]      
Assumptions      
Weighted-average grant date fair value of units granted in period (in dollars per share) $ 148.02 $ 153.00 $ 128.20