Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance recoveries									$ 0.4	$ 3.7	$ 10.4
Deferred income taxes expense (benefit)									(31.0)	86.4	9.9
Contract related intangible asset impairment				$ 5.1					5.1
Business interruption insurance proceeds	$ 0.9		$ 1.4	$ 2.0					4.3
Current Income Tax Expense (Benefit)									37.0	10.9	$ 22.6
Non-cash income tax expense related to uncertain tax positions	7.2
Kronos Worldwide, Inc. | US-Canada APA
Current Income Tax Expense (Benefit)	2.2	$ (5.6)
Kronos Worldwide, Inc. | Direct investment in subsidiary excess carrying amount
Deferred income taxes expense (benefit)					$ (29.3)	$ (29.3)	$ (29.3)		6.5
Germany and Belgian | Kronos Worldwide, Inc.
Non-cash deferred income tax expense					6.4	2.3	150.3
Deferred income taxes expense (benefit)	(4.3)	$ (0.8)	$ 2.9
Attributable to Parent Net of Tax
Insurance recoveries								$ 3.0
Chemicals
Business interruption insurance proceeds									$ 4.3
Waste Management
Out of period adjustment to transaction costs related to proposed sale	4.3
Out of period adjustment to transaction costs net of tax related to proposed sale	$ 2.7
Employee Severance | Chemicals
Restructuring charges					$ 0.2	$ 0.4	$ 21.1			$ 21.7