CONTINGENCIES (Details) $ in Millions	Apr. 11, 2019 defendant	Apr. 03, 2021 USD ($)	Dec. 31, 2020 USD ($)
Recovery From Countervailing Duty Tariff Proceedings
Loss Contingencies [Line Items]
Amount sought by company			$ 4.1
Countervailing Duty Tariff Proceedings
Loss Contingencies [Line Items]
Tariff rate for imports (as a percent)		0.00%
Antidumping Tariff Proceedings
Loss Contingencies [Line Items]
Tariff rate for imports (as a percent)		8.47%
RCRA Facility Investigation
Loss Contingencies [Line Items]
Liability accrual		$ 4.5
PCE/TCE Northeast Contamination Site
Loss Contingencies [Line Items]
Liability accrual		4.4
Aurora Plastics LLC vs. Atrium
Loss Contingencies [Line Items]
Liability accrual		3.9
Voigt Vs. C D R Case
Loss Contingencies [Line Items]
Number of defendants | defendant	12
Current Liabilities | RCRA Facility Investigation
Loss Contingencies [Line Items]
Liability accrual		1.0
Other Current Liabilities | Aurora Plastics LLC vs. Atrium
Loss Contingencies [Line Items]
Liability accrual		$ 2.3