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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Litigation settlement expense, net |  |  |  |  |  | $ 19.3 |  | $ 19.3 | $ 62.0
Infrastructure reimbursement |  |  | $ 19.1 |  |  | 8.8 | $ 19.7 | 9.2 | 4.3
Insurance recoveries |  |  |  |  |  | $ 7.7 | 1.6 | 7.7 | 1.3
Gain on land sales |  | $ 4.0 |  |  | $ 4.4 |  | 4.5 | 4.4 | 12.5
Gain on sale of insurance and risk management business |  |  |  | $ 3.0 |  |  | $ 4.9 | $ 3.0 | 58.4
Waste Management |  |  |  |  |  |  |  |  |
Pre-tax gain from disposal of discontinued operations | $ 4.9 |  |  |  |  |  |  |  | $ 58.4

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