Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Hexacomb working capital adjustment	$ 2.3	$ 0.0
DeRidder mill incident	(5.0)	0.0
Asset disposals and write-offs	(2.3)	(1.8)
Integration-related, facilities closure and other costs (c)	(0.8)	(2.0)
Other	(1.2)	(0.1)
Total	(7.0)	$ (3.9)
DeRidder, Louisiana
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
DeRidder mill incident	(5.0)
Hexacomb in Europe and Mexico
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Hexacomb working capital adjustment	$ 2.3