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Revenue Recognition
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
The 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
September 30, 2021
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$71,479 $200,484 $48,553 $320,516 
Western Europe106,859 — 16,915 123,774 
Latin America (c)
35,072 — 693 35,765 
Asia-Pacific30,228 — 7,755 37,983 
Middle East and Africa20,804 — — 20,804 
Eastern Europe 5,459 — — 5,459 
Total Revenues$269,901 $200,484 $73,916 $544,301 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$230,340 $— $— $230,340 
Applied products36,091 — — 36,091 
Environmental systems for aluminum dross and scrap processing3,470 — — 3,470 
Railway track maintenance equipment— — 33,553 33,553 
After market parts and services; safety and diagnostic technology— — 33,030 33,030 
Railway contracting services— — 7,333 7,333 
Waste processing, recycling, reuse and transportation solutions— 200,484 — 200,484 
Total Revenues$269,901 $200,484 $73,916 $544,301 

Three Months Ended
September 30, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$58,973 $194,098 $62,805 $315,876 
Western Europe92,506 — 21,416 113,922 
Latin America (c)
29,085 — 412 29,497 
Asia-Pacific22,079 — 8,160 30,239 
Middle East and Africa15,558 — — 15,558 
Eastern Europe 4,306 — — 4,306 
Total Revenues $222,507 $194,098 $92,793 $509,398 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$181,867 $— $— $181,867 
Applied products38,166 — — 38,166 
Environmental systems for aluminum dross and scrap processing2,474 — — 2,474 
Railway track maintenance equipment— — 55,493 55,493 
After market parts and services; safety and diagnostic technology— — 29,100 29,100 
Railway contracting services— — 8,200 8,200 
Three Months Ended
September 30, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Waste processing, recycling, reuse and transportation solutions— 194,098 — 194,098 
Total Revenues$222,507 $194,098 $92,793 $509,398 
Nine Months Ended
September 30, 2021
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$208,395 $585,891 $185,812 $980,098 
Western Europe336,011 — 47,220 383,231 
Latin America (c)
99,524 — 1,821 101,345 
Asia-Pacific80,520 — 21,799 102,319 
Middle East and Africa60,798 — — 60,798 
Eastern Europe 15,185 — — 15,185 
Total Revenues $800,433 $585,891 $256,652 $1,642,976 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$688,923 $— $— $688,923 
Applied products100,706 — — 100,706 
Environmental systems for aluminum dross and scrap processing10,804 — — 10,804 
Railway track maintenance equipment— — 140,116 140,116 
After market parts and services; safety and diagnostic technology— — 94,470 94,470 
Railway contracting services— — 22,066 22,066 
Waste processing, recycling, reuse and transportation solutions— 585,891 — 585,891 
Total Revenues$800,433 $585,891 $256,652 $1,642,976 
Nine Months Ended
September 30, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$186,210 $434,489 $173,039 $793,738 
Western Europe271,795 — 56,435 328,230 
Latin America (c)
87,453 — 1,592 89,045 
Asia-Pacific63,969 — 21,908 85,877 
Middle East and Africa46,240 — — 46,240 
Eastern Europe 12,390 — — 12,390 
Total Revenues$668,057 $434,489 $252,974 $1,355,520 
Nine Months Ended
September 30, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$563,701 $— $— $563,701 
Applied products95,019 — — 95,019 
Environmental systems for aluminum dross and scrap processing9,337 — — 9,337 
Railway track maintenance equipment— — 138,519 138,519 
After market parts and services; safety and diagnostic technology— — 92,800 92,800 
Railway contracting services— — 21,655 21,655 
Waste processing, recycling, reuse and transportation solutions— 434,489 — 434,489 
Total Revenues$668,057 $434,489 $252,974 $1,355,520 
(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 $111.8 million and $60.1 million at September 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 $67.8 million and $84.9 million at September 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 nine months ended September 30, 2021, the Company recognized approximately $14 million and $44 million, respectively, of revenue related to amounts previously included in Advances on contracts. During the three and nine months ended September 30, 2020, the Company recognized approximately $20 million and $55 million, respectively, of revenue related to amounts previously included in Advances on contracts.
At September 30, 2021 the Harsco Environmental Segment had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $88.8 million. Of this amount, $20.9 million is expected to be fulfilled by September 30, 2022, $20.3 million by September 30, 2023, $19.3 million by September 30, 2024, $19.2 million by September 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 September 30, 2021 the Harsco Rail Segment had remaining, fixed, unsatisfied performance obligations where the remaining expected contract duration exceeds one year totaling $246.3 million. Of this amount, $117.8 million is expected to be fulfilled by September 30, 2022, $73.0 million by September 30, 2023, $37.4 million by September 30, 2024, $18.0 million by September 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 September 30, 2021 and December 31, 2020 the remaining estimated forward loss provision of $3.8 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 $5.4 million and $11.8 million of revenues for the contracts with SBB on an over time basis, utilizing a cost-to-cost method for the three months ended September 30, 2021 and 2020, respectively and $15.4 million and $29.5 million for the nine months ended September 30, 2021 and 2020, respectively. The Company has substantially completed the first contract and is approximately 81% complete on the second contract with SBB as of September 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.