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RESTRUCTURING ACTIVITIES - Asset Restructuring Plan (Details) - Asset restructuring plan $ in Millions	3 Months Ended		6 Months Ended		31 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	$ 0.7	$ 1.5	$ (7.1)	$ 3.0	$ 55.8
Change in cost estimate of asset retirement obligation			(8.1)
Activities
Reserve balance at December 31, 2024			1.2
Restructuring charges			1.0
Payments			(1.8)
Reserve balance at June 30, 2025	0.4		0.4		0.4
Engineered Materials
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges			(0.3)
Polymer Solutions
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	0.7	1.5	(6.8)	3.0
Severance and Related Benefit Costs
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges			(0.3)	(0.6)	8.7
Activities
Reserve balance at December 31, 2024			1.2
Restructuring charges			(0.3)
Payments			(0.5)
Reserve balance at June 30, 2025	0.4		0.4		0.4
Asset related charges (credits)
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges		0.2	(8.1)	0.5	35.2
Change in cost estimate of asset retirement obligation			(8.1)
Accelerated depreciation for the asset retirement cost
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges					19.2
Accelerated depreciation charges of plant, property and equipment associated with the exit
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges					7.7
Decommissioning and other charges
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges					8.3
Contract terminations
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	0.7	$ 1.3	1.3	$ 3.1	11.8
Restructuring costs expected to incur	$ 5.5		5.5		$ 5.5
Activities
Restructuring charges			1.3
Payments			$ (1.3)