Intangible Assets - Major Classes of Amortizable Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, net	$ 3,877.6	$ 3,954.0
Expiration Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	6,749.3	6,696.8
Accumulated amortization	(2,941.1)	(2,812.2)
Amortizable intangible assets, net	3,808.2	3,884.6
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	78.5	76.0
Accumulated amortization	(64.4)	(62.8)
Amortizable intangible assets, net	14.1	13.2
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	106.1	105.2
Accumulated amortization	(50.8)	(49.0)
Amortizable intangible assets, net	$ 55.3	$ 56.2