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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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Disposal Group, Net Gain on Disposal

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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