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Other Income (Expense), Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
DeRidder mill incident $ 2.6   $ 0.1  
Acquisition and integration related costs (0.5) $ (2.0) (0.8) $ (2.3)
Hexacomb working capital adjustment     2.3  
Asset disposals and write-offs (3.9) (0.6) (8.6) (3.5)
Other 0.6 (2.0) (0.8) (3.5)
Total (24.8) (6.2) (32.4) (15.2)
Facilities closure and other costs        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges (0.9) $ (1.6) (1.9) $ (5.9)
Wallula Mill        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges $ (22.7)   $ (22.7)