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Revenue Recognition
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue RecognitionThe Company recognizes revenues to depict the transfer of promised services and products to customers in an amount that reflects the consideration the Company expects to receive in exchange for those services or products. Service revenues include
the Harsco Clean Earth Segment and the service components of the Harsco Environmental and Harsco Rail Segments. Product revenues include portions of the Harsco Environmental and Harsco Rail Segments.

A summary of the Company's revenues by primary geographical markets as well as by key product and service groups is as follows:
Three Months Ended
June 30, 2021
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$69,735 $196,128 $78,998 $344,861 
Western Europe116,981 — 13,672 130,653 
Latin America (c)
33,799 — 568 34,367 
Asia-Pacific26,922 — 7,908 34,830 
Middle East and Africa19,873 — — 19,873 
Eastern Europe 5,236 — — 5,236 
Total Revenues$272,546 $196,128 $101,146 $569,820 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$233,523 $— $— $233,523 
Applied products34,830 — — 34,830 
Environmental systems for aluminum dross and scrap processing4,193 — — 4,193 
Railway track maintenance equipment— — 60,123 60,123 
After market parts and services; safety and diagnostic technology— — 34,671 34,671 
Railway contracting services— — 6,352 6,352 
Waste processing, recycling, reuse and transportation solutions— 196,128 — 196,128 
Total Revenues$272,546 $196,128 $101,146 $569,820 


Three Months Ended
June 30, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$57,356 $161,579 $56,461 $275,396 
Western Europe82,972 — 16,855 99,827 
Latin America (c)
25,108 — 515 25,623 
Asia-Pacific19,894 — 7,880 27,774 
Middle East and Africa14,793 — — 14,793 
Eastern Europe 3,868 — — 3,868 
Total Revenues $203,991 $161,579 $81,711 $447,281 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$174,238 $— $— $174,238 
Applied products26,591 — — 26,591 
Environmental systems for aluminum dross and scrap processing3,162 — — 3,162 
Railway track maintenance equipment— — 40,411 40,411 
After market parts and services; safety and diagnostic technology— — 32,500 32,500 
Railway contracting services— — 8,800 8,800 
Waste processing, recycling, reuse and transportation solutions— 161,579 — 161,579 
Total Revenues$203,991 $161,579 $81,711 $447,281 
Six Months Ended
June 30, 2021
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$136,916 $385,407 $137,259 $659,582 
Western Europe229,152 — 30,305 259,457 
Latin America (c)
64,452 — 1,128 65,580 
Asia-Pacific50,292 — 14,044 64,336 
Middle East and Africa39,994 — — 39,994 
Eastern Europe 9,726 — — 9,726 
Total Revenues $530,532 $385,407 $182,736 $1,098,675 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$458,583 $— $— $458,583 
Applied products64,615 — — 64,615 
Environmental systems for aluminum dross and scrap processing7,334 — — 7,334 
Railway track maintenance equipment— — 106,563 106,563 
After market parts and services; safety and diagnostic technology— — 61,440 61,440 
Railway contracting services— — 14,733 14,733 
Waste processing, recycling, reuse and transportation solutions— 385,407 — 385,407 
Total Revenues$530,532 $385,407 $182,736 $1,098,675 
Six Months Ended
June 30, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$127,237 $240,391 $110,234 $477,862 
Western Europe179,289 — 35,019 214,308 
Latin America (c)
58,368 — 1,180 59,548 
Asia-Pacific41,890 — 13,748 55,638 
Middle East and Africa30,682 — — 30,682 
Eastern Europe 8,084 — — 8,084 
Total Revenues$445,550 $240,391 $160,181 $846,122 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$381,834 $— $— $381,834 
Applied products56,853 — — 56,853 
Environmental systems for aluminum dross and scrap processing6,863 — — 6,863 
Railway track maintenance equipment— — 83,026 83,026 
After market parts and services; safety and diagnostic technology— — 63,700 63,700 
Railway contracting services— — 13,455 13,455 
Waste processing, recycling, reuse and transportation solutions— 240,391 — 240,391 
Total Revenues$445,550 $240,391 $160,181 $846,122 
(a)    The Company's acquisition of ESOL closed on April 6, 2020. The results are included in the Harsco Clean Earth Segment. See Note 3, Acquisitions and Dispositions, for additional details.
(b)     Revenues are attributed to individual countries based on the location of the facility generating the revenue.
(c)     Includes Mexico.

The Company may receive payments in advance of earning revenue, which are treated as Advances on contracts on the Condensed Consolidated Balance Sheets. The Company may recognize revenue in advance of being able to contractually
invoice the customer, which is treated as Contract assets on the Condensed Consolidated Balance Sheets. Non-current contract assets are included in Other assets on the Condensed Consolidated Balance Sheets. Contract assets are transferred to Trade accounts receivable, net, when the right to payment becomes unconditional. Contract assets and Contract liabilities are reported as a net position, on a contract-by-contract basis, at the end of each reporting period. These instances are primarily related to the Harsco Rail Segment.

The Company had Contract assets totaling $97.8 million and $60.1 million at June 30, 2021 and December 31, 2020, respectively. The increase is due principally to additional contract assets recognized in excess of the transfer of contract assets to accounts receivable, primarily in the Harsco Rail Segment. The Company had Advances on contracts totaling $70.0 million and $84.9 million at June 30, 2021 and December 31, 2020, respectively. The decrease is due principally to the recognition of revenue on previously received Advances on contracts in excess of the receipt of new advances on contracts during the period, primarily in the Harsco Rail Segment. During the three and six months ended June 30, 2021, the Company recognized approximately $13 million and $30 million, respectively, of revenue related to amounts previously included in Advances on contracts. During the three and six months ended June 30, 2020, the Company recognized approximately $16 million and $34 million, respectively, of revenue related to amounts previously included in Advances on contracts.
At June 30, 2021 the Harsco Environmental Segment had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $71.3 million. Of this amount, $17.6 million is expected to be fulfilled by June 30, 2022, $16.8 million by June 30, 2023, $15.7 million by June 30, 2024, $15.5 million by June 30, 2025 and the remainder thereafter. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year.

At June 30, 2021 the Harsco Rail Segment had remaining, fixed, unsatisfied performance obligations where the remaining expected contract duration exceeds one year totaling $265.1 million. Of this amount, $111.9 million is expected to be fulfilled by June 30, 2022, $74.7 million by June 30, 2023, $51.5 million by June 30, 2024, $25.0 million by June 30, 2025 and the remainder thereafter. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year.

The Company recognized an initial estimated forward loss provision related to the contracts with SBB of $45.1 million for the year ended December 31, 2016. The Company recorded an additional forward loss provision of $1.8 million for the year ended December 31, 2018. At June 30, 2021 and December 31, 2020 the remaining estimated forward loss provision of $3.3 million and $4.4 million, respectively, is included in the caption Other current liabilities on the Condensed Consolidated Balance Sheets. The estimated forward loss provision represents the Company's best estimate based on currently available information. It is possible that the Company's overall estimate of costs to complete these contracts may increase, which would result in an additional estimated forward loss provision at such time.

The Company recognized $4.8 million and $7.6 million of revenues for the contracts with SBB on an over time basis, utilizing a cost-to-cost method for the three months ended June 30, 2021 and 2020, respectively and $10.0 million and $17.7 million for the six months ended June 30, 2021 and 2020, respectively. The Company has substantially completed the first contract and is approximately 78% complete on the second contract with SBB as of June 30, 2021.

The Company provides assurance type warranties primarily for product sales in the Harsco Rail Segment. These warranties are typically not priced or negotiated separately (there is no option to separately purchase the warranty) or the warranty does not provide customers with a service in addition to the assurance that the product complies with agreed-upon specifications. Accordingly, such warranties do not represent separate performance obligations.
Concurrent with the ESOL acquisition, the Company entered into an agreement with Stericycle Inc. related to certain Stericycle, Inc. customers who receive services from both ESOL and other Stericycle, Inc. businesses under a single contractual arrangement. The revenue pertaining to services rendered to these customers are invoiced centrally through Stericycle, Inc. billing systems and ESOL's portion of the revenue, less a management fee, is then distributed to the Company.