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Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 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 | $ 22.4 | $ 14.7
Incremental net tax on earnings and losses of non-U.S. and non-tax group companies | 4.1 | 11.2
Non-U.S. tax rates | 7.0 | (2.4)
Valuation allowance | 0.3 | (5.0)
Adjustment to the reserve for uncertain tax positions, net | 1.6 | 0.5
Nondeductible expenses | 0.4 | 0.4
Domestic production activities deduction |  | (0.6)
U.S. state income taxes and other, net | 1.8 | (0.2)
Income tax expense | 36.2 | 18.6
Comprehensive provision for income taxes (benefit) allocable to: |  |
Income from continuing operations | 36.2 | 18.6
Discontinued operations | 20.1 | (0.8)
Retained earnings – change in accounting principle | 1.1 |
Other comprehensive income (loss): |  |
Currency translation | 1.4 | 1.8
Interest rate swap |  | 0.4
Marketable securities |  | (0.1)
Total | 60.2 | 20.7
Kronos Worldwide, Inc. | Canada – Germany APA |  |
Schedule Of Income Tax [Line Items] |  |
Canada – Germany APA | (1.4) |
Pension Plans |  |
Other comprehensive income (loss): |  |
Defined benefit plans | 1.5 | 0.9
OPEB Plans |  |
Other comprehensive income (loss): |  |
Defined benefit plans | $ (0.1) | $ (0.1)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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