Contingencies Hardboard Contingencies Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingency Accrual [Roll Forward]
Beginning Balance	$ 14.2
Adjusted to expense (income) during the year		$ 0.0	$ 0.0
Ending Balance	16.8	14.2
Reserve for Environmental Costs [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	13.6	14.9
Adjusted to expense (income) during the year	0.5	1.3	1.3
Payments for Environmental Liabilities	(0.7)	(3.1)	(0.5)
Ending Balance	16.6	13.6	14.9
Other operating charges and credits [Member]
Loss Contingency Accrual [Roll Forward]
Adjusted to expense (income) during the year	3.2	0.5	$ 0.0
Hardboard Siding Reserves
Loss Contingency Accrual [Roll Forward]
Beginning Balance	0.6
Ending Balance	$ 0.2	$ 0.6