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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Narrative (Details) metricTon in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) metricTon	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) metricTon	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) metricTon
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other operating expense (income)	$ (28.9)	$ (7.5)	$ (60.7)	$ (7.3)
Recognized earnings	0.0	8.2	29.6	16.5
Mark - to - market gain (loss)	(1.9)	(8.2)	(2.8)	(7.8)
Translation adjustments of hedges	(0.5)	(0.8)	(1.7)	(0.9)
Short-term investments	300.0		300.0		$ 99.5
Short term investments, fair value	300.0		300.0		99.6
Purge Rite Intermediate, LLC
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other operating expense (income)	28.8		62.0
Interest rate swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative, notional amount					1,000.0
Foreign Exchange Contract
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized gain (losses)	6.1	$ (1.2)	9.5	$ (5.9)
Foreign Exchange Contract \| Economic hedges
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative, notional amount	$ 386.3		$ 386.3		$ 149.8
Economic hedges \| Aluminum
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative nonmonetary amounts \| metricTon	15,240.0		15,240.0		10,310.0
Economic hedges \| Copper
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative nonmonetary amounts \| metricTon	18,374.3		18,374.3		8,754.8
Economic hedges \| Steel
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative nonmonetary amounts \| metricTon	14,995.8		14,995.8