Contingencies Hardboard Contingencies Rollforward (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingency Accrual [Roll Forward]
Beginning Balance	$ 15.3
Adjusted to expense (income) during the year	0	0	5.0
Ending Balance	14.2	15.3
Reserve for Environmental Costs [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	14.9	14.1	15.0
Adjusted to expense (income) during the year	1.3	1.3	0.7
Payments for Environmental Liabilities	(3.1)	(0.5)	0
Payments made for claims	0	0	(1.6)
Ending Balance	13.6	14.9	14.1
Other operating charges and credits [Member]
Loss Contingency Accrual [Roll Forward]
Adjusted to expense (income) during the year	0.5
Hardboard Siding Reserves
Loss Contingency Accrual [Roll Forward]
Ending Balance	$ 0.6	$ 0.4

Amount of loss contingency liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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Amount of payments made reducing loss contingency liability.

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Amount of increase (decrease) in loss contingency liability.

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Cash outflows made during the period for environmental remediation activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 17

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