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Equity - Additional Information (Detail) - Kronos Worldwide, Inc. $ in Millions | 3 Months Ended
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Jun. 30, 2019 USD ($) shares
Equity Class Of Treasury Stock [Line Items] |
Common stock, Repurchased | 110,000
Stock repurchase, aggregate purchase price | $ | $ 1.4
Shares available for purchase | 1,800,000

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