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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Non-cash income tax benefit recognized related to completion of audit |  |  |  |  |  | $ 3.2 |  |  |
Provision (benefit) for income taxes related to previous periods |  |  |  |  | $ 1.2 |  |  |  |
Insurance recoveries |  |  |  |  |  |  | $ 3.7 | $ 10.4 | $ 9.4
Deferred income taxes |  |  |  |  |  |  | 85.7 | $ 10.0 | $ (114.8)
Kronos Worldwide, Inc. | Direct investment in subsidiary excess carrying amount |  |  |  |  |  |  |  |  |
Deferred income taxes | $ 29.3 | $ 29.3 | $ 29.3 |  |  |  |  |  |
German and Belgium | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |
Non-cash deferred income tax expense | 6.4 | 2.3 | 150.3 |  |  |  |  |  |
Employee Severance | Chemicals |  |  |  |  |  |  |  |  |
Restructuring charges | $ 0.2 | $ 0.4 | $ 21.1 |  |  |  | $ 21.7 |  |
Attributable to Parent Net of Tax |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  | $ 3.0 | $ 7.3 |  |  |  |

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