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Capital Stock (Option Grant Assumptions) (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Capital Stock [Abstract]      
Weighted-average fair value per share $ 83.59 $ 68.08 $ 53.35
Risk-free interest rate 4.00% 1.80% 0.80%
Expected dividend yield 1.20% 1.00% 1.20%
Expected stock price volatility 29.00% 27.00% 26.90%
Expected option life (years) 6 years 2 months 12 days 5 years 10 months 24 days 5 years 10 months 24 days