Selected Segment Data (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2017			2016			2017			2016
Net Sales
Siding	$	226.2		$	194.8		$	671.2		$	583.3
OSB	350.9			282.1			944.3			751.9
EWP	98.1			80.7			274.4			230.5
South America	38.3			31.7			114.8			103.2
Other	6.5			7.6			22.3			20.3
Intersegment sales	(1.7		)	(0.5		)	(3.7		)	(5.8		)
	$	718.3		$	596.4		$	2,023.3		$	1,683.4
Operating profit (loss):
Siding	$	52.8		$	35.2		$	141.5		$	103.9
OSB	126.4			67.4			289.4			126.7
EWP	6.3			—			12.0			(2.0		)
South America	5.8			3.3			16.4			15.3
Other	(1.6		)	(0.4		)	(2.7		)	(1.0		)
Other operating credits and charges, net	0.9			—			(4.5		)	(11.4		)
Gain (loss) on sale or impairment of long-lived assets, net	(0.7		)	(0.3		)	1.8			(1.0		)
General corporate and other expenses, net	(30.0		)	(26.9		)	(85.7		)	(78.1		)
Interest expense, net of capitalized interest	(4.9		)	(9.0		)	(14.8		)	(26.3		)
Investment income	2.9			2.5			7.2			6.4
Loss on early debt extinguishment	—			(13.2		)	—			(13.2		)
Other non-operating items	(0.6		)	(0.5		)	(2.4		)	1.4
Income from continuing operations before taxes	157.3			58.1			358.2			120.7
Provision (benefit) for income taxes	46.4			(7.5		)	97.9			13.1
Income from continuing operations	$	110.9		$	65.6		$	260.3		$	107.6