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Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule Of Income Tax [Line Items] |  |  |  |
Expected tax expense, at U.S. federal statutory income tax rate of 21% | $ 2.1 | $ 5.1 | $ 14.5 | $ 22.7
Non-U.S. tax rates | 0.1 | 1.2 | 0.7 | 5.9
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies | 0.1 | (1.1) | (4.5) | (2.2)
Global intangible low-tax income, net | (0.9) | 0.1 | 3.3 | 1.6
Valuation allowance | 0.5 |  | 0.5 |
Adjustment to the reserve for uncertain tax positions, net | (0.5) | 0.2 |  | 0.6
Nondeductible expenses |  | 0.3 | 1.0 | 0.9
Other, net | 0.4 | 0.5 | (0.2) | 1.0
Income tax expense | 1.8 | 6.3 | 15.3 | 30.5
Comprehensive provision for income taxes allocable to: |  |  |  |
Net income | 1.8 | 6.3 | 15.3 | 30.5
Other comprehensive income (loss): |  |  |  |
Total | 3.2 | 7.5 | 19.4 | 34.0
Defined Benefit Pension Plans |  |  |  |
Other comprehensive income (loss): |  |  |  |
Benefit plans | $ 1.4 | $ 1.2 | 4.2 | 3.6
OPEB |  |  |  |
Other comprehensive income (loss): |  |  |  |
Benefit plans |  |  | $ (0.1) | $ (0.1)

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