Goodwill and Other Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 831.8	$ 967.2
Accumulated Amortization	(168.2)	(155.2)
Net Balance	663.6	812.0
Noncompetition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Amount	4.1	4.1
Accumulated Amortization	(4.1)	(4.0)
Net Balance	0.0	0.1
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	421.0	423.7
Accumulated Amortization	(79.9)	(62.7)
Net Balance	341.1	361.0
Operating Permits
Finite-Lived Intangible Assets [Line Items]
Gross Amount	369.2	502.2
Accumulated Amortization	(55.8)	(61.4)
Net Balance	313.4	440.8
Use Rights And Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	14.2	13.9
Accumulated Amortization	(12.5)	(12.4)
Net Balance	1.7	1.5
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Amount	23.3	23.3
Accumulated Amortization	(15.9)	(14.7)
Net Balance	$ 7.4	$ 8.6