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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Contract related intangible asset impairment |  |  |  |  |  |  |  | $ 5.1 |  | $ 5.1 |
Business interruption insurance proceeds |  |  |  |  | $ 0.9 |  | $ 1.4 | $ 2.0 |  | 4.3 |
Current Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | $ 125.8 | 45.0 | $ 18.4
Deferred income taxes expense (benefit) |  |  |  |  |  |  |  |  | (245.8) | (26.4) | 89.1
Non-cash income tax expense related to uncertain tax positions |  |  |  |  | 7.2 |  |  |  |  |  |
Loss on prepayment of debt |  | $ 7.1 |  |  |  |  |  |  | 7.1 |  |
Current income tax expense provisional pursuant to transition tax | $ 76.2 |  |  |  |  |  |  |  | 76.2 |  |
Deferred income tax benefit from change in enacted tax rate |  |  |  |  |  |  |  |  | 77.1 |  |
Valuation allowance |  |  |  |  |  |  |  |  | (205.4) | (2.2) | $ 159.0
Waste Management |  |  |  |  |  |  |  |  |  |  |
Out of period adjustment to transaction costs related to proposed sale |  |  |  |  | 4.3 |  |  |  |  |  |
Out of period adjustment to transaction costs net of tax related to proposed sale |  |  |  |  | 2.7 |  |  |  |  |  |
Canada - Germany APA |  |  |  |  |  |  |  |  |  |  |
Non-cash income tax expense related to uncertain tax positions |  | 8.1 |  |  |  |  |  |  | $ 8.6 |  |
U.S. – Canada APA |  | (11.8) |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | US-Canada APA |  |  |  |  |  |  |  |  |  |  |
Current Income Tax Expense (Benefit) |  |  |  |  | 2.2 | $ (5.6) |  |  |  |  |
U.S. – Canada APA |  |  |  |  |  |  |  |  |  | $ (3.4) |
Non Cash Deferred Income Tax Benefit | Deferred Income Tax Liability | U.S. Federal Corporate Income Tax Rate |  |  |  |  |  |  |  |  |  |  |
Deferred income tax benefit from change in enacted tax rate | 77.1 |  |  |  |  |  |  |  |  |  |
Aggregate provisional non-cash deferred income tax expense (benefit) | 5.3 |  |  |  |  |  |  |  |  |  |
Valuation Allowance of Deferred Tax Assets | One Non-U.S. subsidiary | Expected Future Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |
Valuation allowance | (18.7) |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Valuation Allowance of Deferred Tax Assets | Germany and Belgium | Current Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes expense (benefit) |  |  |  |  | $ (4.3) | $ (0.8) | $ 2.9 |  |  |  |
Kronos Worldwide, Inc. | Valuation Allowance of Deferred Tax Assets | Germany and Belgium | Expected Future Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes expense (benefit) | (16.3) | $ (7.8) |  | $ (5.0) |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Valuation Allowance of Deferred Tax Assets | One Non-U.S. subsidiary | Expected Future Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes expense (benefit) |  |  | $ 157.6 |  |  |  |  |  |  |  |
Valuation allowance | $ (18.7) |  |  |  |  |  |  |  |  |  |

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