FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) metricTon	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) metricTon	Jun. 30, 2024 USD ($)	Dec. 31, 2024 metricTon	Dec. 06, 2024 shares
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Recognized earnings	$ 8,200,000	$ 10,700,000	$ 16,500,000	$ 21,400,000
Cash flow hedge loss expected to be reclassified within twelve months			27,900,000
Mark-to-market gain (loss)	(8,200,000)	3,800,000	(7,800,000)	3,100,000
Change in fair value of warrant liabilities	0	25,400,000	0	202,000,000.0
Translation adjustments of hedges	(800,000)	1,900,000	(900,000)	5,300,000
Private Placement Warrant
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Private warrants	0		0
Private Placement Warrant | Common Class A
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Number of warrants exercised (in shares) | shares						5,266,667
Private Placement Warrant | Common Class A | Common Share Capital
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Number of shares issued upon warrants exercised (in shares) | shares						4,812,521
Foreign Exchange Contract
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized losses (gain)	$ 1,200,000	$ 600,000	$ 5,900,000	$ 600,000
Economic hedges | Aluminum
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative nonmonetary amounts | metricTon	8,700		8,700		10,730
Economic hedges | Copper
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative nonmonetary amounts | metricTon	7,190		7,190		7,330