Lease Accounting - Schedule of Minimum Cash Lease Payments (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash paid for amounts included in the measurement of lease liabilities
Cash outflows for operating leases	$ 210.7	$ 209.3
Cash outflows for finance leases - operating activities	3.7	4.1
Cash outflows for finance leases - financing activities	10.7	10.8
Non-cash amount of right-of-use assets obtained in exchange for:
Operating lease liability additions, net of write-offs	$ 73.3	$ 78.5