Marketable securities (Tables)

3 Months Ended

Mar. 31, 2013

Classification of Marketable Securities

Marketable security	Fair value measurement level		Market Value		Cost Basis		Unrealized gains
			(In millions)
As of December 31, 2012:
Valhi common stock		1	$	21.5	$	15.3	$	6.2
NL and CompX common stocks		1		.1		.1		—
Total			$	21.6	$	15.4	$	6.2
As of March 31, 2013:
Valhi common stock		1	$	27.6	$	15.3	$	12.3
NL and CompX common stocks		1		.1		.1		—
Total			$	27.7	$	15.4	$	12.3