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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

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