Tembec Acquisition - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions			1 Months Ended	12 Months Ended
	Nov. 17, 2017 USD ($) $ / shares shares	Nov. 17, 2017 CAD ($) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Common shares, par value (in dollars per share) | $ / shares	$ 0.01			$ 0.01	$ 0.01
Gain on bargain purchase				$ 0	$ 20,449,000	$ 316,555,000
Tembec Inc.
Business Acquisition [Line Items]
Cash consideration		$ 317
Stock consideration (in shares) | shares	8.4	8.4
Gain on bargain purchase	$ 317,000,000				$ 20,000,000	317,000,000
Net revenue			$ 139,000,000
Operating income			$ 0
Acquisition related expenses						34,000,000
Unaudited pro forma net income attributable to the Company						111,000,000
Depreciation on Acquired Property, Plant and Equipment | Tembec Inc.
Business Acquisition [Line Items]
Unaudited pro forma net income attributable to the Company						15,000,000
Amortization on Intangible Assets | Tembec Inc.
Business Acquisition [Line Items]
Unaudited pro forma net income attributable to the Company						7,000,000
Acquisition-related Costs | Tembec Inc.
Business Acquisition [Line Items]
Unaudited pro forma net income attributable to the Company						49,000,000
Fair Value Write Up of Inventory | Tembec Inc.
Business Acquisition [Line Items]
Unaudited pro forma net income attributable to the Company						23,000,000
Elimination Interest Expense Related to Debt Repaid, Net of Interest Expense Associated with Financing Cash Portion of Acquisition | Tembec Inc.
Business Acquisition [Line Items]
Unaudited pro forma net income attributable to the Company						$ 38,000,000