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Income and other taxes (Tables)
 12 Months Ended
Dec. 31, 2024
Income Taxes [Abstract]  
Schedule of components of income tax (expense) recovery Income tax (expense) recovery:
For the years ended December 31
20242023
Current tax (expense) recovery:
Current period before undernoted items
$(74,169)$(64,679)
Adjustments to prior years including resolution for certain outstanding audits43 14,755 
(74,126)(49,924)
Deferred tax recovery (expense):
Origination and reversal of temporary differences
52,396 46,982 
Adjustments to prior years including resolution for certain outstanding audits(383)6,904 
Changes in tax rates
34 (5,828)
Impact of foreign exchange and other
(7,762)377 
44,285 48,435 
Total income tax expense
$(29,841)$(1,489)
Schedule of reconciliation of accounting profit multiplied by applicable tax rates Income tax expense differs from the amounts that would be obtained by applying the Canadian statutory income tax rate to net income before income taxes as follows:
For the years ended December 31
20242023
Income before income taxes
$280,086 $285,611 
Deduct earnings of associate
(38,335)(99,466)
241,751 186,145 
Canadian statutory tax rate
24.5 %24.5 %
Income tax expense calculated at Canadian statutory tax rate
(59,229)(45,606)
Decrease (increase) in income tax expense resulting from:
Impact of income and losses taxed in foreign jurisdictions
14,268 27,260 
Utilization of unrecognized loss carryforwards and temporary differences
6,482 7,381 
Impact of tax rate changes
34 (5,828)
Impact of foreign exchange
1,650 5,287 
Other business taxes
2,791 (13,943)
Impact of items not taxable for tax purposes
4,555 2,373 
Adjustments to prior years including resolution for certain outstanding audits(340)21,658 
Other
(52)(71)
Total income tax expense
$(29,841)$(1,489)
Schedule of effect of temporary difference, unused tax losses and unused tax credits and analysis of change in deferred income tax liabilities The tax effect of temporary differences that give rise to deferred income tax liabilities and deferred income tax assets is as follows:
As at
Dec 31, 2024Dec 31, 2023
Net
Deferred tax assets
Deferred tax liabilities
Net
Deferred tax assets
Deferred tax liabilities
Property, plant and equipment (owned)
$(325,338)$(162,036)$(163,302)$(363,644)$(189,646)$(173,998)
Right-of-use assets
(35,757)(25,816)(9,941)(35,883)(28,299)(7,584)
Repatriation taxes
(119,281)(30)(119,251)(109,186)(7)(109,179)
Other
(26,241)(11,267)(14,974)(31,630)(9,259)(22,371)
(506,617)(199,149)(307,468)(540,343)(227,212)(313,131)
Non-capital loss carryforwards
357,670 346,150 11,520 358,774 321,602 37,172 
Lease obligations
48,706 35,740 12,966 48,633 37,854 10,779 
Share-based compensation
24,567 8,185 16,382 16,391 651 15,740 
Other
40,652 13,165 27,487 50,955 19,355 31,600 
471,595 403,240 68,355 474,753 379,462 95,291 
Net deferred income tax assets (liabilities)
$(35,022)$204,091 $(239,113)$(65,590)$152,250 $(217,840)

As at December 31, 2024, deferred income tax assets have been recognized in respect of non-capital loss carryforwards generated in the United States. These loss carryforwards expire as follows:
Dec 31 2024
Gross amountTax effect
Expire
Losses generated in 2015 (expires 2035)
$282,437 $62,136 
Losses generated in 2016 (expires 2036)
432,581 95,168 
Losses generated in 2017 (expires 2037)
234,941 51,687 
949,959 208,991 
No expiry
Losses generated in 2019255,244 56,154 
Losses generated in 2020121,321 26,691 
Losses generated in 2023
23,721 5,219 
Losses generated in 2024
6,636 1,460 
Total non-capital loss carryforwards
$1,356,881 $298,515 
Analysis of the change in deferred income tax assets and liabilities:
20242023
NetDeferred tax assetsDeferred tax liabilitiesNetDeferred tax assetsDeferred tax liabilities
Balance, January 1
$(65,590)$152,250 $(217,840)

$(180,643)$46,353 $(226,996)
Deferred income tax recovery (expense) included in net income
44,285 65,244 (20,959)48,435 40,159 8,276 
Deferred income tax recovery (expense) included in other comprehensive income
(14,096)(13,403)(693)66,636 65,738 898 
Other
379 — 379 

(17)— (17)
Balance, December 31
$(35,022)$204,091 $(239,113)$(65,590)$152,250 $(217,840)