Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets:	$ 1,098.5	$ 1,098.5	$ 1,093.5	$ 1,086.3
Accumulated amortization	(724.9)	(724.9)	(682.3)	(656.3)
Total future amortization expense	373.6	373.6	411.2	430.0
Indefinite-lived trademarks	9.8	9.8	9.8	9.8
Total intangibles, net	$ 383.4	$ 383.4	421.0	439.8
Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted-Average Remaining Life (Years)	15 years 1 month 6 days	15 years 1 month 6 days
Non-compete agreements
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets:	$ 0.0	$ 0.0	0.2	0.2
Customer relationships
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets:	$ 1,097.5	$ 1,097.5	1,092.3	1,086.1
Customer relationships | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted-Average Remaining Life (Years)	15 years 1 month 6 days	15 years 1 month 6 days
Trademarks
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets:	$ 1.0	$ 1.0	$ 1.0	$ 0.0
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted-Average Remaining Life (Years)	6 months	6 months