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RESTRUCTURING ACTIVITIES - 2024 Restructuring Plan and Stade Shutdown (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		21 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026
RESTRUCTURING ACTIVITIES
Accretion expense			$ 1.9
2024 Restructuring Plan and Stade Shutdown
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	$ 1.0	$ 6.0	2.3	$ 8.4	$ 64.6
Activities
Reserve balance at December 31, 2025			14.2
Restructuring charges (credits)			1.7
Payments			(11.8)
Reserve balance at June 30, 2026	4.1		4.1		4.1
2024 Restructuring Plan and Stade Shutdown \| Severance and related benefit credits (credits)
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	(0.3)	0.5	(0.2)	(0.1)	22.5
Activities
Reserve balance at December 31, 2025			14.2
Restructuring charges (credits)			(0.2)
Payments			(9.9)
Reserve balance at June 30, 2026	4.1		4.1		4.1
2024 Restructuring Plan and Stade Shutdown \| Asset Related Charges
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	0.3	0.5	0.6	1.5	29.2
2024 Restructuring Plan and Stade Shutdown \| Accelerated depreciation for the asset retirement cost
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	0.3		0.6		19.9
2024 Restructuring Plan and Stade Shutdown \| Accelerated depreciation charges of plant, property and equipment associated with the exit
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges					5.6
2024 Restructuring Plan and Stade Shutdown \| Other charges
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges					3.7
2024 Restructuring Plan and Stade Shutdown \| Contract terminations
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	1.0	5.0	1.9	7.0	12.9
Activities
Restructuring charges (credits)			1.9
Payments			(1.9)
2024 Restructuring Plan and Stade Shutdown \| Employee termination benefits
Activities
Reserve balance at December 31, 2025			14.2
Reserve balance at June 30, 2026	4.1		4.1		4.1
2024 Restructuring Plan and Stade Shutdown \| Corporate
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges		(0.1)
2024 Restructuring Plan and Stade Shutdown \| Engineered Materials
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	(0.1)	0.1	(0.1)	(0.2)
2024 Restructuring Plan and Stade Shutdown \| Latex Binders
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	(0.2)		(0.2)
2024 Restructuring Plan and Stade Shutdown \| Polymer Solutions
RESTRUCTURING ACTIVITIES
Net pre-tax restructuring charges	1.3	$ 6.0	2.6	$ 8.6
2024 Restructuring Plan and Stade Shutdown \| Polymer Solutions \| Asset Related Charges
RESTRUCTURING ACTIVITIES
Restructuring costs expected to incur	0.5		0.5		0.5
2024 Restructuring Plan and Stade Shutdown \| Polymer Solutions \| Contract terminations \| Minimum
RESTRUCTURING ACTIVITIES
Restructuring costs expected to incur	7.0		7.0		7.0
2024 Restructuring Plan and Stade Shutdown \| Polymer Solutions \| Contract terminations \| Maximum
RESTRUCTURING ACTIVITIES
Restructuring costs expected to incur	$ 9.0		$ 9.0		$ 9.0