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Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule Of Income Tax [Line Items]
Expected tax expense, at U.S. federal statutory income tax rate of 21%	$ 9.1	$ 20.9
Non-U.S. tax rates	2.4	7.1
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies	(0.5)	0.4
Global intangible low-tax income, net	0.8
Adjustment to reserve for uncertain tax positions, net	0.2	1.4
Other, net	0.8	0.6
Income tax expense	12.8	29.0
Comprehensive provision for income taxes allocable to:
Net income	12.8	29.0
Total	14.0	30.1
Defined Benefit Pension Plans
Comprehensive provision for income taxes allocable to:
Other comprehensive income - pension plans	$ 1.2	1.1
Canada - Germany APA
Schedule Of Income Tax [Line Items]
Canada-Germany APA		$ (1.4)

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