Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Income Tax [Line Items]
United States	$ 131.4	$ 45.2	$ 23.5
Non-U.S. subsidiaries	126.4	55.4	81.2
Income from continuing operations before income taxes	257.8	100.6	104.7
Expected tax expense at U.S. federal statutory income tax rate of 21%	54.1	21.1	22.0
Non-U.S. tax rates	4.5	0.5	5.2
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. tax group companies	(2.0)	(8.7)	(4.5)
Valuation allowance	0.9	3.8	4.5
Global intangible low-tax income, net	2.8	2.2	1.8
Tax rate changes		(0.2)	4.7
U.S. state income taxes, net	1.5	0.9	(0.3)
Adjustment to the reserve for uncertain tax positions, net	(2.6)	(3.8)	(5.1)
Nondeductible expenses	1.1	1.0	1.5
Refund of prior tax payments, net	0.1		(2.1)
Other, net	(0.3)	(0.9)	(1.2)
Income tax expense (benefit)	60.1	15.9	26.5
Comprehensive provision for income taxes allocable to:
Income tax expense (benefit)	60.1	15.9	26.5
Discontinued operations		0.6
Other comprehensive income (loss):
Currency translation	(0.8)	1.6	(0.2)
Total	89.0	10.4	10.2
Defined Benefit Pension Plans
Other comprehensive income (loss):
Defined benefit plans	$ 29.7	(7.3)	(15.6)
Other comprehensive income (loss)
Other comprehensive income (loss):
Defined benefit plans		$ (0.4)	$ (0.5)