Other Income, Net - Schedule of Components of Other Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest income and other:
Interest and dividends	$ 1.1	$ 0.9
Securities transactions, net	(0.2)
Total	0.9	0.9
Infrastructure reimbursement		6.2
Currency transactions, net	(1.5)	(0.5)
Other, net	$ 0.6	0.4
Total		$ 7.0