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Goodwill - Changes in Goodwill (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022
Goodwill [Line Items] |  |
Balance at January 1, 2022 |  | $ 3,494.4
Acquisitions |  | 3.7
Adjustments to purchase price allocations | $ 46.6 | 57.8
Divestitures |  | (159.7)
Goodwill reclassified from assets held for sale |  | 4.3
Balance at June 30, 2022 | 3,400.5 | 3,400.5
East Group |  |
Goodwill [Line Items] |  |
Balance at January 1, 2022 |  | 759.4
Adjustments to purchase price allocations |  | 5.0
Balance at June 30, 2022 | 764.4 | 764.4
West Group |  |
Goodwill [Line Items] |  |
Balance at January 1, 2022 |  | 2,735.0
Acquisitions |  | 3.7
Adjustments to purchase price allocations |  | 52.8
Divestitures |  | (159.7)
Goodwill reclassified from assets held for sale |  | 4.3
Balance at June 30, 2022 | $ 2,636.1 | $ 2,636.1

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