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Acquisitions and Dispositions - Acquisitions Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 06, 2020 | Jun. 28, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Additional interest expense |  |  | $ 16,004,000 | $ 15,794,000 | $ 48,854,000 | $ 43,396,000
Gain (loss) on sale of discontinued business |  |  | $ 0 | 0 | $ 0 | 18,371,000
Stericycle |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Corporate charge |  |  |  |  |  | 8,900,000
ESOL |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired | 100.00% |  |  |  |  |
Cash consideration | $ 429,000,000 |  |  |  |  |
Goodwill to be deductible for income tax purposes | $ 36,800,000 |  |  |  |  |
Direct acquisition costs |  |  |  | $ 10,600,000 |  | 41,000,000
Harsco Clean Earth Segment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired |  | 100.00% |  |  |  |
Cash consideration |  | $ 628,000,000 |  |  |  |
Business Acquisition, Purchased Enterprise Valuation |  | $ 625,000,000 |  |  |  |
Clean Earth and ESOL |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Additional interest expense |  |  |  |  |  | $ 4,700,000

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