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Supplemental cash flow information - Financing activities (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance $ 3,407,953  
Changes from financing cash flows:    
Dividends paid (158,297) $ (158,310)
Interest paid (69,498) (70,446)
Shares issued, stock option plan 4 0
Total cash changes (227,791) (228,756)
Non-cash changes:    
Amortization of issue costs 1,144  
Dividends declared 158,297  
Interest expense 72,067  
Shares issued, stock option plan 2  
Total non-cash changes 231,510  
Ending balance 3,411,672 3,407,953
Long-term borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 1,493,327  
Changes from financing cash flows:    
Dividends paid 0  
Interest paid 0  
Shares issued, stock option plan 0  
Total cash changes 0  
Non-cash changes:    
Amortization of issue costs 1,144  
Dividends declared 0  
Interest expense 0  
Shares issued, stock option plan 0  
Total non-cash changes 1,144  
Ending balance 1,494,471 1,493,327
Interest payable [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 12,401  
Changes from financing cash flows:    
Dividends paid 0  
Interest paid (69,498)  
Shares issued, stock option plan 0  
Total cash changes (69,498)  
Non-cash changes:    
Amortization of issue costs 0  
Dividends declared 0  
Interest expense 72,067  
Shares issued, stock option plan 0  
Total non-cash changes 72,067  
Ending balance 14,970 12,401
Dividends Payable [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 39,579  
Changes from financing cash flows:    
Dividends paid (158,297)  
Interest paid 0  
Shares issued, stock option plan 0  
Total cash changes (158,297)  
Non-cash changes:    
Amortization of issue costs 0  
Dividends declared 158,297  
Interest expense 0  
Shares issued, stock option plan 0  
Total non-cash changes 158,297  
Ending balance 39,579 39,579
Share capital [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 1,862,646  
Changes from financing cash flows:    
Dividends paid 0  
Interest paid 0  
Shares issued, stock option plan 4  
Total cash changes 4  
Non-cash changes:    
Amortization of issue costs 0  
Dividends declared 0  
Interest expense 0  
Shares issued, stock option plan 2  
Total non-cash changes 2  
Ending balance $ 1,862,652 $ 1,862,646