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Stock-Based Compensation - Weighted-Average Fair Value Assumptions (Details) - CAD ($)
3 Months Ended 6 Months Ended
Jul. 21, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividends declared per share   $ 0.8300 $ 0.8300 $ 1.6600 $ 1.4800
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected option life (years)       4 years 9 months  
Risk-free interest rate       1.29%  
Expected stock price volatility       23.11%  
Expected annual dividends per share       $ 3.3200  
Estimated forfeiture rate       4.40%  
Weighted-average grant date fair value per option granted during the period       $ 68.86  
Dividends declared per share $ 0.9500        
Forecast | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected annual dividends per share $ 3.8000