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IMPAIRMENT OF LONG-LIVED ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of long-lived assets | $ (9.0) | $ (92.0) |
Impairment of long-lived assets |  |  | $ 11.0
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 |

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- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 + Details
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