Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Short-term Investments and Financial Instruments Carried at Fair Value

The following table summarizes the valuation of our short-term investments and financial instruments by the ASC Topic 820 categories as of December 31, 2020 and 2021:

	Fair Value Measurements
			Quoted		Significant
			Prices in		Other
			Active		Observable
			Markets		Inputs
	Total		(Level 1)		(Level 2)
	(In millions)
December 31, 2020:
Marketable securities:
Current	$	4.4	$	—	$	4.4
Noncurrent		2.9		.2		2.7
December 31, 2021:
Marketable securities:
Current	$	2.6	$	—	$	2.6
Noncurrent		3.3		2.0		1.3

Financial Instruments not Carried at Fair Value

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2020 and 2021:

	December 31, 2020				December 31, 2021
	Carrying		Fair		Carrying		Fair
	amount		value		amount		value
	(In millions)
Cash, cash equivalents and restricted cash equivalents	$	570.3	$	570.3	$	792.9	$	792.9
Deferred payment obligation		1.3		1.3		—		—
Long-term debt (excluding capitalized leases):
Kronos Senior Notes		485.7		499.9		448.8		460.2
Valhi credit facility with Contran		270.7		270.7		172.9		172.9
BMI bank note payable		16.3		16.9		15.4		15.9
LandWell bank note payable		14.2		14.2		13.5		13.5