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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule Of Income Tax [Line Items]
Expected tax expense, at U.S. federal statutory income tax rate of 21%	$ 12.7	$ 7.3	$ 28.6	$ 12.7
Non-U.S. tax rates	1.2	1.0	3.2	1.7
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. companies	(0.1)	(0.8)	(0.5)	(1.5)
Valuation allowance, net	(0.6)	0.6	(0.7)	1.1
Global intangible low-tax income, net	0.8	0.5	1.7	1.0
Adjustment to the reserve for uncertain tax positions, net	0.3	0.1	(0.5)	(0.4)
Other, net	0.2	0.3	0.7	0.2
Income tax expense	14.8	9.2	33.1	15.2
Comprehensive provision for income taxes allocable to:
Net income	14.8	9.2	33.1	15.2
Other comprehensive income (loss):
Total	15.8	10.8	35.2	18.4
Defined Benefit Pension Plans
Other comprehensive income (loss):
Benefit plans	$ 1.0	$ 1.6	$ 2.1	$ 3.2