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Capital Stock (Option Grant Assumptions) (Details) - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Capital Stock [Abstract]      
Weighted-average fair value per share $ 118.22 $ 83.59 $ 68.08
Risk-free interest rate 4.30% 4.00% 1.80%
Expected dividend yield 1.10% 1.20% 1.00%
Expected stock price volatility 29.90% 29.00% 27.00%
Expected option life (years) 6 years 3 months 18 days 6 years 2 months 12 days 5 years 10 months 24 days