COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) site proceeding claim	Dec. 31, 2012 CAD ($)	Dec. 31, 1999 municipality	Dec. 31, 1968 permit	Dec. 31, 2020 USD ($) proceeding
Loss Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 30,400,000				$ 29,800,000
Number of proceedings as defendant | proceeding	69
Number of product liability claims settled or dismissed | claim	12
Legal and Administrative Proceedings
Loss Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 23,200,000				24,000,000
Ville Mercier
Loss Contingencies [Line Items]
Number of permits issued by government, for dumping organic liquid | permit				2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec | municipality			3
General damages sought | $		$ 2.9
Punitive damages sought | $		$ 10.0
Superfund Proceedings
Loss Contingencies [Line Items]
Number of sites owned by third party excluded from cleanup or related liabilities	131
Number of sites owned by the entity subject to proceedings under federal or state superfund laws	6
Number of sites owned by third parties	125
Number of sites for which environmental remediation expense is settled	30
Third party sites requiring expenditure on remediation	15
Number of sites not currently requiring expenditures on remediation	80
Minimum potential liability | $	$ 1,000,000
Number of sites, potential liability exceeds substantial quota	3
Notices received from owners of third parties sites seeking indemnifications from the company	18
BR Facility | Remedial Liabilities for Inactive Sites
Loss Contingencies [Line Items]
Increase of remedial liabilities | $	$ 3,300,000
ChemWaste
Loss Contingencies [Line Items]
Indemnification agreement with third party sites	18
Federal and State Enforcement Actions
Loss Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 7,200,000				$ 5,800,000
Number of proceedings as defendant | proceeding	1				0
Minimum potential liability | $	$ 1,000,000				$ 1,000,000