Leases - Lease expense (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Lease cost:
Operating lease	[1]	$ 27.6	$ 29.2
Short-term lease		4.5	4.9
Total lease cost		$ 32.1	$ 34.1

[1] Operating lease cost includes an immaterial amount of variable expenses, offset by certain sublease rental income.