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Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule Of Income Tax [Line Items] |  |  |  |
Expected tax expense, at U.S. federal statutory income tax rate of 21% | $ 14.9 | $ 1.7 | $ 30.3 | $ 15.6
Incremental net tax benefit on earnings and losses of non-U.S., U.S. and non-tax group companies | (0.7) | (3.9) | (2.6) | (7.8)
Non-U.S. tax rates | 1.3 | (0.2) | 3.1 | 0.8
Valuation allowance | (0.7) | (2.1) | 0.8 | 4.9
Adjustment to the reserve for uncertain tax positions, net | 0.3 | (0.5) | 0.1 | 0.7
Global intangible low-tax income, net | 0.9 | (6.8) | 1.9 | 6.3
Nondeductible expenses | 0.3 | (0.5) | 0.7 | 1.3
U.S. state income taxes and other, net | 0.6 | 0.9 | 0.9 | (0.6)
Income tax expense (benefit) | 16.9 | (11.4) | 35.2 | 21.2
Comprehensive provision (benefit) for income taxes allocable to: |  |  |  |
Net income | 16.9 | (11.4) | 35.2 | 21.2
Other comprehensive income (loss): |  |  |  |
Currency translation | (0.8) | 1.2 | (0.4) | (1.5)
Total | 18.0 | (8.4) | 40.8 | 25.0
OPEB |  |  |  |
Other comprehensive income (loss): |  |  |  |
Defined benefit plans | (0.1) | (0.1) | (0.2) | (0.2)
Pension Plans |  |  |  |
Other comprehensive income (loss): |  |  |  |
Defined benefit plans | $ 2.0 | $ 1.9 | $ 6.2 | $ 5.5

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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