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Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule Of Income Tax [Line Items] |  |  |  |
Expected tax expense, at U.S. federal statutory income tax rate of 21% | $ 8.5 | $ 23.2 | $ 17.6 | $ 44.1
Non-U.S. tax rates | 2.3 | 7.9 | 4.7 | 15.0
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies | (0.6) | 0.7 | (1.1) | 1.1
Global intangible low-tax income, net | 0.7 |  | 1.5 |
Adjustment to reserve for uncertain tax positions, net | 0.2 |  | 0.4 | 1.4
Other, net | 0.3 | 0.6 | 1.1 | 1.2
Income tax expense | 11.4 | 32.4 | 24.2 | 61.4
Comprehensive provision for income taxes allocable to: |  |  |  |
Net income | 11.4 | 32.4 | 24.2 | 61.4
Other comprehensive income (loss): |  |  |  |
Total | 12.5 | 33.4 | 26.5 | 63.5
Defined Benefit Pension Plans |  |  |  |
Other comprehensive income (loss): |  |  |  |
Benefit plans | 1.2 | 1.1 | 2.4 | 2.2
OPEB |  |  |  |
Other comprehensive income (loss): |  |  |  |
Benefit plans | $ (0.1) | $ (0.1) | $ (0.1) | (0.1)
Canada - Germany APA |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Canada-Germany APA |  |  |  | $ (1.4)

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