IMPAIRMENT OF LONG-LIVED ASSETS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	$ (9.0)
Nonoperating Assets in Canada, Minnesota and Texas [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	47.0
EWP Facility Producing LSL and OSB [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	39.0
Siding Facility Expected To Sell [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	$ 5.0