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Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule Of Income Tax [Line Items] |  |  |  |  |
Expected tax expense, at U.S. federal statutory income tax rate of 35% in 2017 and 21% in 2018 | $ 11.9 | $ 26.9 | $ 43.1 | $ 63.5 |
Incremental net tax on earnings and losses of non-U.S., U.S. and non-tax group companies | (160.3) | 8.9 | (151.3) | 57.2 |
Non-U.S. tax rates | 3.5 | (3.5) | 18.4 | (8.2) |
Valuation allowance | (2.0) | (7.8) |  | (170.4) |
Adjustment to the reserve for uncertain tax positions, net | 0.3 | (7.7) | 2.2 | (6.6) |
Transition tax | (2.1) |  | (2.1) |  |
Change in federal tax rate | 59.7 |  | 59.7 |  | $ (77.1)
Change in state tax rate | (3.4) |  | (3.4) |  |
Nondeductible expenses | 0.8 | 0.8 | 1.5 | 1.5 |
U.S. state income taxes and other, net | 0.2 | 0.3 | 0.1 | (1.3) |
Income tax expense (benefit) | (91.4) | 14.7 | (33.2) | (67.5) |
Comprehensive provision for income taxes (benefit) allocable to: |  |  |  |  |
Income from continuing operations | (91.4) | 14.7 | (33.2) | (67.5) |
Discontinued operations | (0.8) | 0.5 | 19.0 | (66.7) |
Retained earnings – change in accounting principle |  |  | 1.1 |  |
Other comprehensive income (loss): |  |  |  |  |
Currency translation | 0.7 | 10.6 | (1.2) | 28.7 |
Marketable securities |  | (0.5) |  | (1.0) |
Interest rate swap |  | 1.3 |  | 1.4 |
Total | (90.2) | 28.0 | (10.2) | (100.8) |
Kronos Worldwide, Inc. | Canada ? Germany APA |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |
Canada – Germany APA |  | (3.2) | (1.4) | (3.2) |
Pension Plans |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |
Defined benefit plans | 1.4 | 1.6 | 4.4 | 4.7 |
OPEB Plans |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |
Defined benefit plans | $ (0.1) | $ (0.2) | $ (0.3) | $ (0.4) |

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