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Related Party Transactions - Summary of Current and Non-Current Receivables from and Payables to Affiliates (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Current receivable from affiliate	$ 18.0us-gaap_DueFromAffiliateCurrent	$ 14.2us-gaap_DueFromAffiliateCurrent
Income taxes receivable from Valhi	3.5kro_IncomeTaxesReceivableFromParent
Current payables to affiliates	19.9us-gaap_DueToAffiliateCurrent	21.7us-gaap_DueToAffiliateCurrent
Income taxes payable to Valhi		0.5kro_IncomeTaxPayableToParent
Louisiana Pigment Company, L.P.
Related Party Transaction [Line Items]
Current receivable from affiliate	13.0	14.2
Current payables to affiliates	19.9	21.1
Other
Related Party Transaction [Line Items]
Current receivable from affiliate	1.5
Current payables to affiliates		0.1
Contran
Related Party Transaction [Line Items]
Note payable to Contran - noncurrent		$ 170.0

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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- Definition

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

The amount for notes payable (written promise to pay), payable to related parties, which are due after one year (or one business cycle).

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