Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gain Contingencies [Line Items]
Gain (Loss) on Contract Termination		$ 0.0	$ 1.0	$ 0.0
Impairment of Intangible Assets, Finite-lived		11.6	0.0
Adjustments related to prior year inventory		0.0	0.0	(4.8)
Inventory adjustment		0.0	0.0	1.6
Adjustment related to prior year depreciation		0.0	0.0	1.6
Refundable value added tax receivable		0.0	0.0	1.4
Insurance Recoveries		0.0	0.5	1.9
Adjustment to contingent consideration fair value		0.2	3.2	20.5
Additions to workers compensation reserves		0.0	(0.4)	(1.0)
Adjustments to retirement accounts		(0.8)	0.0	0.0
Other operating credits and charges, net	$ 11.6	16.3	9.0	3.8
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments		(0.8)	0.0	0.0
Addition to environmental related contingency reserves		(4.6)	(0.5)	(1.0)
Other Expenses			0.0
Other Income		0.1		0.1
Gain loss on settlement, other		1.0	0.0	0.0
Product Warranty Accrual, Period Increase (Decrease)		1.4	(11.3)	(17.7)
Abitibi [Domain]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates		(0.7)	(1.0)	(1.8)
Canfor-LP
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates		0.0	0.0	(0.9)
Unconsolidated Affiliates
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates		$ (0.7)	$ (1.0)	$ (2.7)