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Property, plant and equipment
 12 Months Ended
Dec. 31, 2025
Property, plant and equipment [abstract]  
Property, plant and equipment Property, plant and equipment:
Owned Assets
(a)		Right-of-use assets
(c)		Total
Net book value at December 31, 2025$4,575,161 $622,919 $5,198,080 
Net book value at December 31, 2024$3,501,683 $695,826 $4,197,509 
a) Owned assets:
Buildings, plant
installations and
machinery
Plants Under ConstructionOcean vessels
Other
TOTAL
Cost at January 1, 2025$6,357,420 $— $242,459 $129,920 $6,729,799 
Additions
109,922 — 213 6,783 116,918 
Acquired balances1
1,347,754 — — 9,793 1,357,547 
Disposals and other
(199,113)— — — (199,113)
Cost at December 31, 20257,615,983 — 242,672 146,496 8,005,151 
Accumulated depreciation at January 1, 20253,059,060 — 73,219 95,837 3,228,116 
Depreciation
306,206 — 12,815 2,264 321,285 
Asset impairment charge (b)
60,397 — — — 60,397 
Disposals and other
(179,808)— — — (179,808)
Accumulated depreciation at December 31, 20253,245,855 — 86,034 98,101 3,429,990 
Net book value at December 31, 2025$4,370,128 $— $156,638 $48,395 $4,575,161 
1 On June 27, 2025 the Company completed the acquisition of OCI Global's methanol business. Refer to Note 27 - Agreement to acquire OCI Global's methanol business for further details.
Buildings, plant
installations and
machinery
Plants under
construction
Ocean vesselsOtherTOTAL
Cost at January 1, 2024
$4,880,207 $1,355,497 $240,723 $128,663 $6,605,090 
Additions97,439 123,881 2,013 1,807 225,140 
Disposals and other
(91,338)(8,266)(277)(550)(100,431)
Transfers
1,471,112 (1,471,112)— — — 
Cost at December 31, 2024
6,357,420 — 242,459 129,920 6,729,799 
Accumulated depreciation at January 1, 2024
2,794,702 — 61,390 94,523 2,950,615 
Depreciation
236,398 — 11,829 2,090 250,317 
Asset impairment charge (b)
124,788 — — — 124,788 
Disposals and other
(96,828)— — (776)(97,604)
Accumulated depreciation at December 31, 2024
3,059,060 — 73,219 95,837 3,228,116 
Net book value at December 31, 2024
$3,298,360 $— $169,240 $34,083 $3,501,683 
Based on natural gas feedstock availability and the turnaround completed in 2025, the Company has extended the useful life of the Medicine Hat facility. The effect of these changes on actual and expected depreciation expense was as follows.
20252026202720282029Later
(Decrease) increase in depreciation expense$— $(6,034)$(5,993)$(5,939)$(5,885)$23,812 
b) Asset impairment charge:
The Company reviews the carrying value of long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. The continued decline in New Zealand's forecasted gas profile has been identified as an impairment indicator for the New Zealand cash generating unit ("New Zealand CGU") and the carrying value of the New Zealand CGU was tested for impairment during the year.

The recoverable amount of the New Zealand CGU was based on fair value less costs of disposal, estimated using discounted cash flows. The model contains significant unobservable inputs and as a result is classified within Level 3 of the fair value hierarchy.

There are three key variables that impact the Company’s estimates of future cash flows: (1) the availability of natural gas feedstock, (2) the price of natural gas feedstock, and (3) the methanol price. The Company’s estimate of the availability of natural gas and the price of natural gas takes into consideration the current contracted terms, as well as factors that it believes are relevant to supply under these contracts and supplemental natural gas sources. Methanol price estimates are based on supply and demand fundamentals. The values assigned to the key assumptions represent management's assessment of future trends and have been based on historical data from both external and internal sources.

Based on the test performed, the Company recorded a non-cash before-tax asset impairment charge of $60 million in property, plant and equipment, in addition to $11 million in supplies inventory, for a total impairment charge of $71 million to write down the carrying value of the New Zealand CGU to its recoverable amount of nil.

The following table presents the Level 3 inputs and the sensitivities of the fair value less costs of disposal model to changes in these inputs:
Sensitivities
Valuation inputInput value or rangeChange in inputResulting change in valuation
Natural gas availabilityAnnual estimates based on third party forecasts
 +25%
$+4 million
Methanol price forecast
Regional pricing
+$25 per MT
$+4 million
The sensitivity has been prepared considering each variable independently. It is possible that the assumptions used in establishing fair value amounts will differ from future outcomes and the impact of such variations could be material.
c) Right-of-use (leased) assets:
Ocean vessels
Terminals and tanks
Other
TOTAL
Cost at January 1, 2025$935,169 $366,549 $58,362 $1,360,080 
Acquired balances1
4,010 3,469 1,528 9,007 
Additions
9,262 37,956 11,120 58,338 
Disposals and other
(79,958)(9,044)(1,499)(90,501)
Cost at December 31, 2025868,483 398,930 69,511 1,336,924 
Accumulated depreciation at January 1, 2025406,407 222,571 35,276 664,254 
Depreciation
94,219 37,344 5,715 137,278 
Disposals and other
(79,958)(7,460)(109)(87,527)
Accumulated depreciation at December 31, 2025420,668 252,455 40,882 714,005 
Net book value at December 31, 2025$447,815 $146,475 $28,629 $622,919 
1 Refer to Note 27 - Agreement to acquire OCI Global's methanol business for further details.
Ocean vessels
Terminals and tanks
Other
TOTAL
Cost at January 1, 2024$910,721 $332,441 $58,621 $1,301,783 
Additions
40,055 46,029 4,721 90,805 
Disposals and other
(15,607)(11,921)(4,980)(32,508)
Cost at December 31, 2024935,169 366,549 58,362 1,360,080 
Accumulated depreciation at January 1, 2024314,324 196,303 33,863 544,490 
Depreciation
107,690 38,011 6,364 152,065 
Disposals and other
(15,607)(11,743)(4,951)(32,301)
Accumulated depreciation at December 31, 2024406,407 222,571 35,276 664,254 
Net book value at December 31, 2024$528,762 $143,978 $23,086 $695,826