Selected Segment Data (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

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

	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Net Sales
Siding	$	227.0		$	214.0
OSB	313.3			268.4
EWP	100.7			82.1
South America	42.4			37.8
Other	7.9			8.7
Intersegment sales	—			(0.1		)
	$	691.3		$	610.9
Operating profit (loss):
Siding	$	45.3		$	40.7
OSB	97.4			60.8
EWP	2.8			0.8
South America	8.9			5.1
Other	(0.9		)	(0.2		)
Other operating credits and charges, net	0.4			(3.4		)
Gain (loss) on sale or impairment of long-lived assets, net	0.6			(0.6		)
General corporate and other expenses, net	(27.3		)	(27.8		)
Interest expense, net of capitalized interest	(4.4		)	(5.0		)
Investment income	3.2			2.0
Other non-operating items	(1.4		)	(1.9		)
Income before taxes	124.6			70.5
Provision for income taxes	29.7			15.5
Income from continuing operations	$	94.9		$	55.0