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Stock-Based Compensation - Weighted-Average Fair Value Assumptions (Details) - Stock Options
3 Months Ended
Mar. 31, 2021
CAD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected option life (years) 4 years 9 months
Risk-free interest rate 0.53%
Expected stock price volatility 27.14%
Expected annual dividends per share | $ $ 3.80
Expected forfeiture rate 2.60%
Weighted-average grant date fair value per option granted during the period | $ / shares $ 95.16