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Assets Held For Sale (Details) - Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Nov. 02, 2018
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Revenue		$ 66.2	$ 62.3
Disposal Group, Operating Income (Loss)		(0.4)	$ 0.6
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Other Operating Income (Expense) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss on sale of NEO assets	$ 10.4	$ 10.4
Goodwill, Impairment Loss	1.0
Severance Costs	$ 0.6
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Consideration Received				$ 15.0

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