Controlling interest description.

No definition available.

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- Definition

Organization and basis of presentation.

+ References

No definition available.

+ Details

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- Definition

Percentage of related party's outstanding common stock owned by parent company.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Percentage of parent company's common stock held by private parent company and its subsidiaries.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

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- Definition

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
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- Details

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- Details

Name:	dei_LegalEntityAxis=kro_ValhiIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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- Details

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Organization and basis of presentation - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2025	Jul. 16, 2024	Jul. 15, 2024
Louisiana Pigment Company (LPC)
Organization And Basis Of Presentation [Line Items]
Percentage acquired		50.00%
Percentage held through wholly-owned subsidiary			50.00%
Valhi Inc \| Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	50.00%
Valhi Inc \| NL Industries Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage in company	83.00%
NL Industries Inc. \| Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	31.00%
Contran
Organization And Basis Of Presentation [Line Items]
Controlling interest description	Consequently, at June 30, 2025, Ms. Simmons and the Family Trust may be deemed to control Contran, and therefore may be deemed to indirectly control the wholly-owned subsidiary of Contran, Valhi, NL and us.
Contran \| Valhi Inc
Organization And Basis Of Presentation [Line Items]
Ownership percentage of parent company held by related party	91.00%