Cover - USD ($)

12 Months Ended

Dec. 31, 2021

Jan. 31, 2022

Jun. 30, 2021

Cover [Abstract]

Document Type

10-K

Document Annual Report

true

Document Transition Report

false

Entity File Number

001-03970

Entity Registrant Name

HARSCO CORP

Entity Incorporation, State or Country Code

DE

Entity Tax Identification Number

23-1483991

Entity Address, Address Line One

350 Poplar Church Road,

Entity Address, City or Town

Camp Hill,

Entity Address, State or Province

PA

Entity Address, Postal Zip Code

17011

City Area Code

717

Local Phone Number

763-7064

Title of 12(b) Security

Common stock, par value $1.25 per share

Trading Symbol

HSC

Security Exchange Name

NYSE

Entity Well-known Seasoned Issuer

Yes

Entity Voluntary Filers

No

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity Filer Category

Large Accelerated Filer

Entity Small Business

false

Entity Emerging Growth Company

false

ICFR Auditor Attestation Flag

true

Entity Shell Company

false

Entity Public Float

$ 1,617,067,000

Entity Common Stock, Shares Outstanding

79,225,394

Current Fiscal Year End Date

--12-31

Entity Central Index Key

0000045876

Document Period End Date

Dec. 31, 2021

Document Fiscal Year Focus

2021

Document Fiscal Period Focus

FY

Amendment Flag

false

Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Selected portions of the 2022 Proxy Statement are incorporated by reference into Part III of this Report.