Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Loss contingency accrual	$ 14.2	$ 15.3
Current portion of contingency reserves	(2.0)	(2.0)
Long-term portion of contingency reserves	12.2	13.3
Reserve for Environmental Costs [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Payments	0	0	1.6
Loss contingency accrual	13.6	14.9	14.1	15.0
Hardboard Siding Reserves
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0.6	$ 0.4