Financial Instruments - Additional Information (Detail) - Senior Notes	Mar. 31, 2021 EUR (€)
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount	€ 1,000
Debt instrument estimated market price per 1000 principal amount	€ 1,019

Debt instrument estimated market price per base principal amount.

No definition available.

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