The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended			1 Months Ended		3 Months Ended			6 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2013	Feb. 28, 2013	Mar. 31, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013
Litigation settlement gain					$ 14.7
Insurance recoveries			10.4us-gaap_InsuranceRecoveries	9.4us-gaap_InsuranceRecoveries	3.3us-gaap_InsuranceRecoveries
Non-cash income tax benefit recognized related to release of portion of reserve for uncertain tax positions		3.2
Provision (benefit) for income taxes related to previous periods	1.2
Kronos Worldwide, Inc. \| Principal Prepayment \| Term Loan
Repayment of credit facility						100	290
Attributable to Parent
Loss on prepayment of debt								3.4
Attributable to Parent Net of Tax
Loss on prepayment of debt										1.2
Insurance recoveries	7.3								4.7
Attributable to Parent Net of Tax \| Basic Management Inc And Landwell
Bargain purchase after-tax gain and remeasurement of existing investment				46.6
Attributable to Parent Net of Tax \| NL
Litigation settlement gain										17.9
Other Expense \| Kronos Worldwide, Inc.
Pre-tax charges of unabsorbed fixed production and other costs										7	28
Unabsorbed Fixed Costs \| Kronos Worldwide, Inc.
Pre-tax charges of unabsorbed fixed production and other costs											19
Unabsorbed Fixed Costs \| Kronos Worldwide, Inc. \| Foreign Pension Plan Defined Benefit \| Pension Curtailment Charge \| Canada
Pre-tax charges of unabsorbed fixed production and other costs									7
Severance and Other Back-to-work Expenses \| Kronos Worldwide, Inc.
Pre-tax charges of unabsorbed fixed production and other costs											$ 2