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Financial Instruments - Additional Information (Detail) - Senior Notes	Sep. 30, 2020 EUR (€)
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount	€ 1,000
Debt instrument estimated market price per €1,000 principal amount	€ 990

X

- Definition

Debt instrument base principal amount.

+ References

No definition available.

+ Details

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

X

- 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

X

- 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

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: