Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain Contingencies [Line Items]
Adjustment to contingent consideration fair value		$ 0.0	$ 0.0	$ 0.2
Adjustments to retirement accounts		3.1	0.0	0.8
Refund of sales and use taxes		0.8	0.0	0.0
Loss related to intangible forest license	$ 11.6	0.0	0.0	11.6
Loss due to marketing settlement		0.0	0.0	(1.0)
Loss on workers compensation reserves		0.9	0.0	0.0
Product Warranty Accrual, Period Increase (Decrease)		5.4	(16.9)	1.4
Addition to environmental related contingency reserves		0.0	0.0	(4.6)
Other Expenses			(0.5)
Other Income		0.6		0.1
Abitibi [Domain]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates		0.0	0.0	0.7
Unconsolidated Affiliates
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates		$ 0.0	$ 0.0	$ 0.7