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Net Income Per Share (Details) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net income    
Net income - basic $ 855,605 $ 1,613,600
Net income - diluted $ 855,605 $ 1,613,600
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]    
Weighted average common shares - basic (in shares) 557,986,000 563,674,000
Dilutive effect of share awards (in shares) 5,849,000 7,936,000
Weighted average common shares - diluted (in shares) 563,835,000 571,610,000
Net income per share    
Basic (in cad per share) $ 1.53 $ 2.86
Diluted (in cad per share) $ 1.52 $ 2.82
Instruments with potential future dilutive effect not included in calculation of diluted earnings per share 300,000 0