Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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- Definition

Fixed charge coverage ratio minimum value.

+ References

No definition available.

+ Details

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- Definition

Line of credit facility expiration month and year.

+ References

No definition available.

+ Details

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Long-Term Debt - Revolving Credit Facility - Additional Information (Detail)		3 Months Ended
	Apr. 20, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 EUR (€)
Line Of Credit Facility [Line Items]
Revolving credit facility, borrowings		$ 0
Kronos Worldwide, Inc. \| Revolving North American Credit Facility
Line Of Credit Facility [Line Items]
Revolving credit facility, borrowings		$ 0
Kronos Worldwide, Inc. \| Revolving Credit Facility
Line Of Credit Facility [Line Items]
Fixed charge coverage ratio, minimum value		100.00%
Kronos Worldwide, Inc. \| Revolving Credit Facility \| Subsequent Event
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	$ 225,000,000
Line of credit, maturity month and year	2026-04
Amount available for borrowing	$ 225,000,000
Kronos Worldwide, Inc. \| Revolving Credit Facility \| Minimum \| Variable Rate
Line Of Credit Facility [Line Items]
Interest rate on outstanding borrowings		1.50%
Kronos Worldwide, Inc. \| Revolving Credit Facility \| Minimum \| Base Rate Option
Line Of Credit Facility [Line Items]
Interest rate on outstanding borrowings		0.50%
Kronos Worldwide, Inc. \| Revolving Credit Facility \| Maximum \| Variable Rate
Line Of Credit Facility [Line Items]
Interest rate on outstanding borrowings		2.00%
Kronos Worldwide, Inc. \| Revolving Credit Facility \| Maximum \| Base Rate Option
Line Of Credit Facility [Line Items]
Interest rate on outstanding borrowings		2.00%
Kronos Worldwide, Inc. \| European Revolving Credit Facility
Line Of Credit Facility [Line Items]
Revolving credit facility, borrowings		$ 0
Kronos Worldwide, Inc. \| Canadian Subsidiary Revolving Borrowings Maximum
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity		$ 25,000,000
Kronos Worldwide, Inc. \| Belgian Subsidiary Revolving Borrowings Maximum
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity \| €			€ 30,000,000
Kronos Worldwide, Inc. \| German Subsidiary Revolving Borrowings Maximum
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity \| €			€ 60,000,000