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Acquisitions and Dispositions - Pro Forma Information (Details) - Clean Earth and ESOL - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Pro forma revenues | $ 447.3 | $ 564.4 | $ 976.8 | $ 1,078.1
Pro forma net income (including discontinued operations) | $ 2.0 | $ 23.5 | $ 2.7 | $ 12.8

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