Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Schedule Of Income Tax [Line Items]
Expected tax expense, at U.S. federal statutory income tax rate of 21%	$ 17.5	$ 6.8
Non-U.S. tax rates	2.1	0.8
Incremental net tax benefit on earnings and losses of non-U.S., U.S. and non-tax group companies	(0.9)	(1.1)
Valuation allowance	0.6	1.2
Global intangible low-tax income, net	0.7	0.5
U.S. state income taxes and other, net	0.6	0.2
Adjustment to the reserve for uncertain tax positions, net	(0.7)	(0.4)
Income tax expense	19.9	8.0
Comprehensive provision for income taxes allocable to:
Net income	19.9	8.0
Other comprehensive income (loss):
Currency translation	0.7	0.2
Other	0.2	(0.1)
Total	22.2	10.2
Pension Plans
Other comprehensive income (loss):
Defined benefit plans	$ 1.4	$ 2.1