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Share-Based Payments - Other Share Based Payment Plan (Details)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) | shares 5,697 5,563
Liabilities accrued $ 355,000 $ 276,000
Compensation expense 610,000 491,000
Sun Share Units and Deferred Share Units (DSU)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Compensation expense 206,000 164,000
Income tax expense (benefit) $ (54,000) $ (43,000)
Sun Shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) | shares 5,013 4,945
Liabilities accrued $ 306,000 $ 233,000
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) | shares 684 618
Liabilities accrued $ 49,000 $ 43,000