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Acquisitions and Dispositions - Financial Information Included in Net Income from Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Amounts for the former Harsco Industrial Segment: |  |  |  |
Gain (loss) on sale of discontinued business | $ 0 | $ 0 | $ 0 | $ 18,371
Harsco Industrial | Discontinued Operations, Held-for-sale |  |  |  |
Amounts for the former Harsco Industrial Segment: |  |  |  |
Total revenues | 0 | 0 | 0 | 10,203
Cost of products sold | 0 | 0 | 0 | 8,082
Gain (loss) on sale of discontinued business | 0 | 0 | 0 | 18,371
Income (loss) from discontinued business | (856) | (716) | (2,859) | (593)
Additional amounts allocated to the former Harsco Industrial Segment: |  |  |  |
Selling, general and administrative expenses | $ 856 | $ 521 | $ 2,859 | $ 1,710

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