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Long-term debt - Long-term debt (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2022
CAD ($)
tranche
payment
Sep. 30, 2022
USD ($)
tranche
payment
Sep. 30, 2021
CAD ($)
Sep. 30, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]            
Borrowings     $ 3,267,034   $ 3,401,656  
Current portion     93,447   392,727  
Long-term debt     3,173,587   3,008,929  
Repayments of borrowings     401,654   1,888,777  
Settled cross-currency swap agreement            
Disclosure of detailed information about borrowings [line items]            
Notional amount     69,300      
2011 U.S. Senior Notes            
Disclosure of detailed information about borrowings [line items]            
Notional amount     319,663     $ 250,000,000
Borrowings     0   318,009  
2011 U.S. Senior Notes | Remaining tranche            
Disclosure of detailed information about borrowings [line items]            
Repayments of borrowings   $ 250,000,000        
2011 U.S. Senior Notes | Remaining tranche | Settled interest rate swap agreement            
Disclosure of detailed information about borrowings [line items]            
Repayments of borrowings $ 319,663          
2014 U.S. Senior Notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings     $ 550,177   $ 570,298  
Number of remaining yearly payments | payment     2 2    
Borrowings, number of tranches | tranche     2 2    
Borrowings, number of yearly payments | payment     7 7    
2014 U.S. Senior Notes | Later than one year and not later than two years            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 412,680     $ 300,000,000
2014 U.S. Senior Notes | Gross carrying amount            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 550,240      
2014 U.S. Senior Notes | Weighted average            
Disclosure of detailed information about borrowings [line items]            
Borrowings, maturity term     1 year 9 months 18 days 1 year 9 months 18 days    
Borrowings, interest rate     3.98%   3.95% 3.98%
2014 U.S. Senior Notes | Remaining total tranches            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 137,560     $ 100,000,000
2014 U.S. Senior Notes | Tranche six | Less than one year            
Disclosure of detailed information about borrowings [line items]            
Notional amount     50,000      
2014 U.S. Senior Notes | Tranche seven | Later than one year and not later than two years            
Disclosure of detailed information about borrowings [line items]            
Notional amount     50,000      
2014 U.S. Senior Notes | Tranche five            
Disclosure of detailed information about borrowings [line items]            
Repayments of borrowings       $ 50,000,000    
2014 U.S. Senior Notes | Tranche five | Settled cross-currency swap agreement            
Disclosure of detailed information about borrowings [line items]            
Repayments of borrowings     64,880      
2021 U.S. Senior Notes            
Disclosure of detailed information about borrowings [line items]            
Notional amount           1,000,000,000
Borrowings     $ 1,361,974   $ 1,253,226  
Borrowings, number of tranches | tranche     2 2    
2021 U.S. Senior Notes | Later than three years and not later than four years            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 825,360     600,000,000
2021 U.S. Senior Notes | Beyond five years            
Disclosure of detailed information about borrowings [line items]            
Notional amount     550,240     $ 400,000,000
2021 U.S. Senior Notes | Gross carrying amount            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 1,375,600      
2021 U.S. Senior Notes | Weighted average            
Disclosure of detailed information about borrowings [line items]            
Borrowings, maturity term     6 years 6 years    
Borrowings, interest rate     1.79%     1.79%
2021 CAD Senior Notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings     $ 595,900   595,331  
Borrowings, interest rate     2.10%     2.10%
2021 CAD Senior Notes | Beyond five years            
Disclosure of detailed information about borrowings [line items]            
Notional amount           $ 600,000,000
2021 CAD Senior Notes | Gross carrying amount            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 600,000      
Unsecured committed term loan credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings     687,705   633,623  
Unsecured committed term loan credit facility | Gross carrying amount            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 687,800      
Unsecured committed term loan credit facility | LIBOR | Weighted average            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate     4.00%     4.00%
Other long-term debt            
Disclosure of detailed information about borrowings [line items]            
Borrowings     $ 71,278   $ 31,169