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Financial Instruments - Additional Information (Detail) - Senior Notes | Sep. 30, 2021 EUR (€)
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Financial Instrument At Fair Value [Line Items] |
Debt instrument base principal amount | € 1,000
Debt instrument estimated market price per 1000 principal amount | € 1,017

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- 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

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- 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

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- 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

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