Debt instrument base principal amount.

No definition available.

Name:	kro_DebtInstrumentBasePrincipalAmount
Namespace Prefix:	kro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument estimated market price per base principal amount.

+ References

No definition available.

+ Details

Name:	kro_DebtInstrumentEstimatedMarketPricePerBasePrincipalAmount
Namespace Prefix:	kro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financial instrument at fair value.

+ References

No definition available.

+ Details

Name:	kro_FinancialInstrumentAtFairValueLineItems
Namespace Prefix:	kro_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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)(a)(1))
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+ Details

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

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeForwardExchangeRate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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+ Details

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

- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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+ Details

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

- Definition

Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
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+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=kro_ThreePointSevenFivePercentageSeniorSecuredNotesDueSeptemberTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

Financial Instruments - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 EUR (€)	Mar. 31, 2025	Dec. 31, 2024
Financial Instrument At Fair Value [Line Items]
Estimated fair value of the currency forward contract \| $	$ 3.2		$ 3.2
Currency transaction gain recognized \| $	$ 9.4	$ (3.8)	$ 5.0	$ 2.0
3.75% Senior Secured Notes due 2025
Financial Instrument At Fair Value [Line Items]
Debt instrument face amount					€ 75,000,000
Debt instrument interest rate	3.75%		3.75%		3.75%	3.75%	3.75%
Debt instrument estimated market price per 1000 principal amount					€ 999
Debt instrument base principal amount					€ 1,000
9.50% Senior Secured Notes due 2029
Financial Instrument At Fair Value [Line Items]
Debt instrument interest rate	9.50%		9.50%		9.50%	9.50%	9.50%
Debt instrument estimated market price per 1000 principal amount					€ 1,079
Debt instrument base principal amount					1,000
Currency forward contract
Financial Instrument At Fair Value [Line Items]
Derivative Notional amount					€ 25,000,000
Derivative Forward Exchange rate	1.05		1.05		1.05
Estimated fair value of the currency forward contract \| $	$ 3.2		$ 3.2
Currency transaction gain recognized \| $	$ 2.3		$ 3.2