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Acquisitions and Dispositions - Pro Forma Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Jan. 31, 2020
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Harsco Industrial IKG |  |
Business Acquisition [Line Items] |  |
Disposal Group, Net Gain on Disposal |  | $ 9.0
Clean Earth and ESOL |  |
Business Acquisition [Line Items] |  |
Pro forma revenues | $ 1,486.2 |
Pro forma net income (loss) attributed to Harsco Corporation (including discontinued operations) (a) | $ 1.0 |

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