Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results of Operations

	Quarter ended
	March 31		June 30			September 30			December 31
	(In millions, except per share data)
Year ended December 31, 2018
Net sales	$	28.4	$	32.4		$	30.0		$	27.4
Gross margin		9.5		11.2			9.6			7.9
Net income (loss)		14.7		(42.0	)		(14.9	)		3.1
Amounts attributable to NL stockholders:
Net income (loss)	$	14.2	$	(42.6	)	$	(15.4	)	$	2.8
Income (loss) per common share	$	.29	$	(.87	)	$	(.32	)	$	.06
Year ended December 31, 2019
Net sales	$	31.2	$	33.7		$	29.7		$	29.6
Gross margin		9.6		11.0			9.4			9.0
Net income (loss)		15.7		6.6			(1.0	)		6.7
Amounts attributable to NL stockholders:
Net income (loss)	$	15.2	$	5.9		$	(1.6	)	$	6.3
Income (loss) per common share	$	.31	$	.12		$	(.03	)	$	.13