Income Taxes (Tables)

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Component of Income Taxes

	Three months ended
	March 31,
	2016			2017
	(In millions)
Expected tax expense (benefit), at U.S. federal    statutory income tax rate of 35%	$	(1.1	)	$	3.8
Rate differences on equity in earnings (losses) of    Kronos		.3			(1.6	)
Nontaxable income		(.2	)		(.2	)
U.S. state income taxes and other, net		.2			.2
Income tax expense (benefit)	$	(0.8	)	$	2.2
Comprehensive provision for income taxes    (benefit) allocable to:
Net income (loss)	$	(0.8	)	$	2.2
Other comprehensive income (loss):
Marketable securities		(.8	)		(.9	)
Currency translation		1.5			.9
Interest rate swap		(.3	)		.1
Pension plans		.4			.5
OPEB plans		(.1	)		(.1	)
Total	$	(.1	)	$	2.7