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Revenue Recognition
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenues
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 and products. Revenues from continuing operations include service revenues from HE and CE and product revenues from HE. Revenue from the Rail business is included in Income (loss) from discontinued businesses.

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, 2023
(In thousands)Harsco Environmental Segment
Clean Earth
Segment		Consolidated Totals
Primary Geographical Markets (a):
North America$78,528 $238,711 $317,239 
Western Europe109,473 — 109,473 
Latin America (b)
44,351 — 44,351 
Asia-Pacific25,787 — 25,787 
Middle East and Africa22,673 — 22,673 
Eastern Europe 5,065 — 5,065 
Total Revenues$285,877 $238,711 $524,588 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$234,274 $— $234,274 
Ecoproducts43,841 — 43,841 
Environmental systems for aluminum dross and scrap processing7,762 — 7,762 
Hazardous waste processing solutions— 194,927 194,927 
Soil and dredged materials processing and reuse solutions— 43,784 43,784 
Total Revenues$285,877 $238,711 $524,588 

Three Months Ended
September 30, 2022
(In thousands)Harsco Environmental SegmentClean Earth
Segment		Consolidated Totals
Primary Geographical Markets (a):
North America$75,229 $222,197 $297,426 
Western Europe92,757 — 92,757 
Latin America (b)
40,574 — 40,574 
Asia-Pacific31,402 — 31,402 
Middle East and Africa20,195 — 20,195 
Eastern Europe 4,560 — 4,560 
Three Months Ended
September 30, 2022
(In thousands)Harsco Environmental SegmentClean Earth
Segment		Consolidated Totals
Total Revenues $264,717 $222,197 $486,914 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$220,578 $— $220,578 
Ecoproducts40,274 — 40,274 
Environmental systems for aluminum dross and scrap processing3,865 — 3,865 
Hazardous waste processing solutions— 182,558 182,558 
Soil and dredged materials processing and reuse solutions— 39,639 39,639 
Total Revenues$264,717 $222,197 $486,914 
Nine Months Ended
September 30, 2023
(In thousands)Harsco Environmental SegmentClean Earth
Segment		Consolidated Totals
Primary Geographical Markets (a):
North America$238,617 $691,750 $930,367 
Western Europe318,177 — 318,177 
Latin America (b)
127,486 — 127,486 
Asia-Pacific87,087 — 87,087 
Middle East and Africa62,195 — 62,195 
Eastern Europe 15,097 — 15,097 
Total Revenues $848,659 $691,750 $1,540,409 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$706,273 $— $706,273 
Ecoproducts122,747 — 122,747 
Environmental systems for aluminum dross and scrap processing19,639 — 19,639 
Hazardous waste processing solutions— 578,545 578,545 
Soil and dredged materials processing and reuse solutions— 113,205 113,205 
Total Revenues$848,659 $691,750 $1,540,409 
Nine Months Ended
September 30, 2022
(In thousands)Harsco Environmental Segment
Clean Earth
Segment		Consolidated Totals
Primary Geographical Markets (a):
North America$227,017 $616,396 $843,413 
Western Europe294,427 — 294,427 
Latin America (b)
115,581 — 115,581 
Asia-Pacific91,420 — 91,420 
Middle East and Africa60,843 — 60,843 
Eastern Europe 15,079 — 15,079 
Total Revenues$804,367 $616,396 $1,420,763 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$684,432 $— $684,432 
Ecoproducts110,322 — 110,322 
Environmental systems for aluminum dross and scrap processing9,613 — 9,613 
Hazardous waste processing solutions— 512,382 512,382 
Nine Months Ended
September 30, 2022
(In thousands)Harsco Environmental Segment
Clean Earth
Segment		Consolidated Totals
Soil and dredged materials processing and reuse solutions— 104,014 104,014 
Total Revenues$804,367 $616,396 $1,420,763 
(a)     Revenues are attributed to individual countries based on the location of the facility generating the revenue.
(b)     Includes Mexico.

The Company may receive payments in advance of earning revenue (advances on contracts), which are included in Other current liabilities and Other liabilities on the Condensed Consolidated Balance Sheets. The Company may recognize revenue in advance of being able to contractually invoice the customer (contract assets), which is included in Other current assets and 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 advances on contracts are reported as a net position, on a contract-by-contract basis, at the end of each reporting period.

The Company had contract assets totaling $7.4 million and $5.3 million at September 30, 2023 and December 31, 2022, respectively. The Company had advances on contracts totaling $4.4 million and $6.8 million at September 30, 2023 and December 31, 2022, respectively. During the three and nine months ended September 30, 2023, the Company recognized $1.0 million and $6.5 million, respectively, of revenue related to amounts previously included in advances on contracts. During the three and nine months ended September 30, 2022, the Company recognized $4.0 million and $14.0 million, respectively, of revenue related to amounts previously included in advances on contracts.
At September 30, 2023, HE had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $61.0 million. Of this amount, $20.4 million is expected to be fulfilled by September 30, 2024, $20.2 million by September 30, 2025, $8.6 million by September 30, 2026, $5.5 million by September 30, 2027 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.