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RETIREMENT PLANS - SERP (Details) - Supplemental Retirement Plan ('SERP') - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
RETIREMENT PLANS
Fair value of plan assets	$ 32.7		$ 32.7		$ 30.7
Trading gains (losses), net	1.1	$ 1.0	1.9	$ 2.7
Defined benefit plan	24.1		24.1		$ 24.5
Selling, general and administrative expenses
RETIREMENT PLANS
Unrealized gains (loss)	$ 1.1	$ 1.1	$ 2.0	$ 2.8

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