Leases - Components of Operating Lease Costs Recognized in Condensed Consolidated Statements of Operations Amounts Include Both Continuing and Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating lease costs	$ 27.3	$ 26.4	$ 54.7	$ 53.2
Amortization of right-of-use assets	3.1	1.4	5.8	2.6
Interest on lease obligations	0.5	0.1	1.0	0.2
Variable lease costs	2.2	2.2	4.4	4.6
Total lease costs	$ 33.2	$ 30.1	$ 65.9	$ 60.6