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NET SALES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 920.0	$ 962.6	$ 1,824.0	$ 1,958.9
Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales	230.1	206.2	419.3	412.4
Latex Binders
Disaggregation of Revenue [Line Items]
Net sales	252.4	254.8	493.9	503.8
Plastics Solutions
Disaggregation of Revenue [Line Items]
Net sales	262.7	281.6	528.4	581.9
Polystyrene
Disaggregation of Revenue [Line Items]
Net sales	174.8	220.0	382.4	460.8
United States
Disaggregation of Revenue [Line Items]
Net sales	264.3	245.3	490.7	496.1
United States | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales	113.3	108.3	208.0	219.2
United States | Latex Binders
Disaggregation of Revenue [Line Items]
Net sales	80.2	70.4	145.5	138.0
United States | Plastics Solutions
Disaggregation of Revenue [Line Items]
Net sales	70.8	66.6	137.2	138.9
Europe
Disaggregation of Revenue [Line Items]
Net sales	444.7	512.8	907.2	1,057.6
Europe | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales	83.5	69.3	158.8	142.8
Europe | Latex Binders
Disaggregation of Revenue [Line Items]
Net sales	108.2	123.8	217.5	252.8
Europe | Plastics Solutions
Disaggregation of Revenue [Line Items]
Net sales	140.1	163.0	282.9	335.1
Europe | Polystyrene
Disaggregation of Revenue [Line Items]
Net sales	112.9	156.7	248.0	326.9
Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales	179.8	171.3	363.9	339.3
Asia-Pacific | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales	31.0	25.7	47.8	44.6
Asia-Pacific | Latex Binders
Disaggregation of Revenue [Line Items]
Net sales	62.4	59.2	128.1	109.9
Asia-Pacific | Plastics Solutions
Disaggregation of Revenue [Line Items]
Net sales	24.5	23.1	53.6	50.9
Asia-Pacific | Polystyrene
Disaggregation of Revenue [Line Items]
Net sales	61.9	63.3	134.4	133.9
Rest of World
Disaggregation of Revenue [Line Items]
Net sales	31.2	33.2	62.2	65.9
Rest of World | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales	2.3	2.9	4.7	5.8
Rest of World | Latex Binders
Disaggregation of Revenue [Line Items]
Net sales	1.6	1.4	2.8	3.1
Rest of World | Plastics Solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 27.3	$ 28.9	$ 54.7	$ 57.0

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