Pending Acquisition - Narrative (Details) - Tembec Inc. shares in Millions	Jul. 23, 2017 USD ($) shares	Aug. 17, 2017 USD ($)	Jul. 23, 2017 CAD / shares
Business Acquisition [Line Items]
Business combination, cash consideration per share (in CAD per share) | CAD / shares			CAD 4.75
Business combination, stock consideration per share (in shares)			0.2542
Business combination, cash consideration as percentage of total consideration			66.80%
Business combination, stock consideration as percentage of total consideration			33.20%
Business acquisition, purchase price	$ 870,000,000
Business acquisition, debt assumed	$ 481,000,000
Number of shares issued related to acquisition (in shares) | shares	8.4
Term Loan
Business Acquisition [Line Items]
Commitments to borrow to fund acquisition		$ 680,000,000