Other Operating Credits and Charges, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gain Contingencies [Line Items]
Insurance Recoveries	$ 0.4			$ 0	$ 0.4	$ 0
Adjustment to contingent consideration fair value	17.3			0	(17.3)	0
Increase (Decrease) in Workers' Compensation Liabilities	(1.0)			0	(1.0)	0
Other Cost and Expense, Operating	0				(0.2)	0.7
Inventory Write-down	0	(4.1)	(1.6)	0	(1.6)	0
Depreciation and amortization	0	(1.5)			(1.5)
Other Expenses	16.1			(1.2)	6.4	(1.2)
Other Operating Income (Expense), Net	16.1			(1.2)	9.1	(1.2)
Product Warranty Accrual, Period Increase (Decrease)	(2.0)			(1.0)	(6.1)	(1.0)
Value Added Tax Receivable	1.4			0	1.4	0
OSB Mills Construction Related Legal Reserves [Member]
Gain Contingencies [Line Items]
Other Cost and Expense, Operating				0.2
Construction related legal reserves	0			0	0	0.5
AbitibiBowater-LP [Member]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates	0			0	(1.8)	0
Canfor-LP [Member]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates	0			0	(0.9)	0
Unconsolidated Affiliates [Member]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates	$ 0			$ 0	$ (2.7)	$ 0