Schedule of Minimum Cash Lease Payments (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Contractual cash payments included in the measurement of lease liabilities
Cash outflows for operating leases	$ 139.1	$ 133.6
Cash outflows for finance leases - operating activities	2.7	3.1
Cash outflows for finance leases - financing activities	7.2	7.3
Non-cash amount of leased assets obtained in exchange for:
Operating lease liability additions, net of write-offs	$ 57.0	$ 55.2