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Product Warranty (Details) CAD in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD	Dec. 31, 2016 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2002 CAD
Product Liability Contingency [Line Items]
Indemnity | CAD					CAD 5.0			CAD 15.0
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning Balance	$ 24.1	$ 21.0
Product Warranty Accrual, Warranties Issued	1.0	0.8	$ 0.7
Adjustment related to product related warranty reserves	5.4	16.9	1.4
Product Warranty Accrual, Discontinued Operations	(1.5)	(0.5)	(2.5)
Product Warranty Accrual, Currency Translation, Increase (Decrease)	2.2	(0.2)	(0.5)
Product Warranty Accrual, Payments	(9.5)	(14.9)	(11.7)
Ending Balance	24.1	21.0	21.0	$ 24.7		$ 24.1	$ 31.4
Current portion of warranty reserves			(6.0)	(9.0)		(9.0)
Long-term portion of warranty reserves			15.0	$ 15.7		$ 15.1
decking [Member]
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Product Warranty Accrual, Warranties Issued	$ 1.5	0.5
Damages from Product Defects [Member]
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Product Warranty Accrual, Discontinued Operations		$ 0.8	$ (2.5)

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Indemnity

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties.

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Amount of increase in the standard and extended product warranty accrual from warranties issued.

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Amount of foreign currency translation gain (loss) which decreases (increases) the standard and extended product warranty accrual.

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