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Share-Based Payments - Other Share Based Payment Plan (Details)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CAD ($)
shares
Dec. 31, 2022
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) | shares 5,563 5,385
Liabilities accrued $ 276,000 $ 232,000
Compensation expense 491,000 227,000
Sun Share Units and Deferred Share Units (DSU)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Compensation expense 164,000 43,000
Income tax expense (benefit) $ (43,000) $ (9,000)
Sun Shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) | shares 4,945 4,675
Liabilities accrued $ 233,000 $ 188,000
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) | shares 618 710
Liabilities accrued $ 43,000 $ 44,000