Selected Segment Data (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

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

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
Dollar amounts in millions	2018			2017			2018			2017
Net sales
Siding	$	240.8		$	226.2		$	729.4		$	671.2
OSB	349.1			350.9			1,049.8			944.3
EWP	104.8			98.1			314.6			274.4
South America	34.5			38.3			122.2			114.8
Other	7.6			6.5			22.9			22.3
Intersegment sales	—			(1.7		)	—			(3.7		)
	$	736.8		$	718.3		$	2,238.9		$	2,023.3
Operating profit (loss):
Siding	$	59.8		$	53.3		$	167.8		$	142.9
OSB	114.8			126.8			369.6			290.6
EWP	8.5			6.5			19.9			12.6
South America	6.5			5.8			25.0			16.4
Other	(1.2		)	(1.6		)	(2.9		)	(2.7		)
Other operating credits and charges, net	6.3			0.9			11.2			(4.5		)
Gain (loss) on sale or impairment of long-lived assets, net	(0.3		)	(0.7		)	0.3			1.8
General corporate and other expenses, net	(27.9		)	(29.5		)	(82.8		)	(84.1		)
Interest expense, net of capitalized interest	(3.9		)	(4.9		)	(12.7		)	(14.8		)
Investment income	5.5			2.9			13.5			7.2
Other non-operating items	(2.2		)	(2.2		)	(4.3		)	(7.2		)
Income from continuing operations before taxes	165.9			157.3			504.6			358.2
Provision for income taxes	41.8			46.4			122.7			97.9
Income from continuing operations	$	124.1		$	110.9		$	381.9		$	260.3