Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)		$ 0.0	$ 0.0
Loss contingency accrual	$ 16.8	14.2
Current portion of contingency reserves	(1.3)	(2.0)
Long-term portion of contingency reserves	15.5	12.2
Other operating charges and credits [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	(3.2)	(0.5)	0.0
Reserve for Environmental Costs [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	(0.5)	(1.3)	(1.3)
Loss contingency accrual	16.6	13.6	$ 14.9	$ 14.1
Hardboard Siding Reserves
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0.2	$ 0.6