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Share-Based Compensation And Other Related Information - Assumptions (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
year
$ / shares
Dec. 31, 2019
USD ($)
year
$ / shares
Dec. 31, 2019
USD ($)
year
$ / shares
Disclosure of share-based payment arrangements [Abstract]      
Expected life | year 4.0 4.0 4.0
Expected volatility 37.90% 37.10% 37.10%
Expected dividend yield 1.10% 1.00% 1.00%
Risk-free interest rate 0.80% 2.00% 2.00%
Weighted average exercise price (CAD$) | (per share) $ 39.45 $ 26.54 $ 26.54
Weighted average fair value (CAD$) | $ $ 15.80 $ 8.34 $ 8.34