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

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
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Balance Type:	na
Period Type:	instant

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Publisher FASB
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Data Type:	xbrli:stringItemType
Balance Type:	na
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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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
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-Section 45
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Balance Type:	credit
Period Type:	duration

- Definition

Floor rate on a debt instrument such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Fixed charge coverage ratio minimum value.

+ References

No definition available.

+ Details

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Namespace Prefix:	vhi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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- Details

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Long-term debt - Revolving Credit Facility - Additional Information (Detail) € in Millions, $ in Millions		9 Months Ended
	Jul. 17, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jul. 17, 2024 EUR (€)	Jul. 16, 2024 USD ($)	Jun. 30, 2024 USD ($)
Line Of Credit Facility [Line Items]
Borrowings on credit facilities		$ 148.6	$ 0.0
Kronos Worldwide, Inc. \| Global Revolver Credit Facility
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	$ 300.0				$ 225.0	$ 300.0
Fixed charge coverage ratio, minimum value	1.00%
Borrowings on credit facilities		148.6
Repayment of credit facility		$ 123.6
Debt instrument, Interest rate during period		7.89%
Debt instrument, Interest rate at period end		6.96%
Amount available for borrowing		$ 268.0
Kronos Worldwide, Inc. \| Global Revolver Credit Facility \| Non Base Rate
Line Of Credit Facility [Line Items]
Interest floor rate	0.25%
Kronos Worldwide, Inc. \| Global Revolver Credit Facility \| Minimum \| Base rate
Line Of Credit Facility [Line Items]
Interest rate spread	0.50%
Kronos Worldwide, Inc. \| Global Revolver Credit Facility \| Minimum \| Non Base Rate
Line Of Credit Facility [Line Items]
Interest rate spread	1.50%
Kronos Worldwide, Inc. \| Global Revolver Credit Facility \| Maximum \| Base rate
Line Of Credit Facility [Line Items]
Interest rate spread	2.00%
Kronos Worldwide, Inc. \| Global Revolver Credit Facility \| Maximum \| Non Base Rate
Line Of Credit Facility [Line Items]
Interest rate spread	2.00%
Kronos Worldwide, Inc. \| Canadian Subsidiary Revolving Borrowings Maximum \| Global Revolver
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	$ 35.0
Kronos Worldwide, Inc. \| Belgian Subsidiary Revolving Borrowings Maximum \| Global Revolver
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity \| €				€ 30
Kronos Worldwide, Inc. \| German Subsidiary Revolving Borrowings Maximum \| Global Revolver
Line Of Credit Facility [Line Items]
Line of credit maximum borrowing capacity \| €				€ 60