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FINANCIAL INSTRUMENTS AND DERIVATIVES (Details) MWh in Thousands, $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($) MWh	Jan. 17, 2025	Dec. 31, 2024 USD ($)
Derivative Instruments
Total debt	$ 2,491.2		$ 2,411.6
Foreign exchange forward contracts
Derivative Instruments
Derivative term	2 months
Not Designated as Hedging Instruments \| Foreign exchange forward contracts
Derivative Instruments
Derivative notional amount	$ 247.8
Euro \| Short \| Not Designated as Hedging Instruments \| Foreign exchange forward contracts
Derivative Instruments
Derivative notional amount	186.0
South Korean Won \| Short \| Not Designated as Hedging Instruments \| Foreign exchange forward contracts
Derivative Instruments
Derivative notional amount	28.9
New Taiwan Dollar \| Long \| Not Designated as Hedging Instruments \| Foreign exchange forward contracts
Derivative Instruments
Derivative notional amount	15.0
Swedish Krona \| Long \| Not Designated as Hedging Instruments \| Foreign exchange forward contracts
Derivative Instruments
Derivative notional amount	9.5
Swiss Franc \| Long \| Not Designated as Hedging Instruments \| Foreign exchange forward contracts
Derivative Instruments
Derivative notional amount	$ 2.4
Cash Flow Hedges \| Commodity Contract
Derivative Instruments
Derivative term	6 months
Number of megawatt hours of natural gas purchases \| MWh	77
Economic Hedges \| Commodity Contract
Derivative Instruments
Amount hedged	$ 0.0
2025 Senior Notes
Derivative Instruments
Total debt			$ 114.8
Interest rate		5.375%	5.375%