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Revenue Recognition
 6 Months Ended
Jun. 30, 2025
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. Service revenues include CE and the service components of HE and Rail. Product revenues include portions of HE and Rail. There are no significant inter-segment sales.

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, 2025
(In thousands)
Harsco Environmental
Segment
Clean Earth
Segment
Harsco Rail
Segment
Consolidated Totals
Primary Geographical Markets (a):
North America$57,613 $246,282 $30,618 $334,513 
Western Europe105,304 — 22,822 128,126 
Latin America (b)
35,546 — 633 36,179 
Asia-Pacific29,828 — 3,890 33,718 
Middle East and Africa24,757 — — 24,757 
Eastern Europe 4,961 — — 4,961 
Total Revenues$258,009 $246,282 $57,963 $562,254 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$240,450 $— $— $240,450 
Ecoproducts12,825 — — 12,825 
Environmental systems for aluminum dross and scrap processing4,734 — — 4,734 
Railway track maintenance equipment— — 15,652 15,652 
After market parts and services; safety and diagnostic technology— — 24,356 24,356 
Railway contracting services— — 17,955 17,955 
Hazardous waste processing solutions— 211,206 — 211,206 
Soil and dredged materials processing and reuse solutions— 35,076 — 35,076 
Total Revenues$258,009 $246,282 $57,963 $562,254 
Three Months Ended
June 30, 2024
(In thousands)
Harsco Environmental
Segment
Clean Earth
Segment
Harsco Rail
Segment
Consolidated Totals
Primary Geographical Markets (a):
North America$84,027 $236,105 $53,044 $373,176 
Western Europe109,620 — 18,652 128,272 
Latin America (b)
41,280 — 1,918 43,198 
Asia-Pacific28,345 — 7,345 35,690 
Middle East and Africa25,182 — — 25,182 
Eastern Europe 4,475 — — 4,475 
Total Revenues $292,929 $236,105 $80,959 $609,993 
Three Months Ended
June 30, 2024
(In thousands)
Harsco Environmental
Segment
Clean Earth
Segment
Harsco Rail
Segment
Consolidated Totals
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$253,685 $— $— $253,685 
Ecoproducts34,263 — — 34,263 
Environmental systems for aluminum dross and scrap processing4,981 — — 4,981 
Railway track maintenance equipment— — 30,517 30,517 
After market parts and services; safety and diagnostic technology— — 35,131 35,131 
Railway contracting services— — 15,311 15,311 
Hazardous waste processing solutions— 194,874 — 194,874 
Soil and dredged materials processing and reuse solutions— 41,231 — 41,231 
Total Revenues$292,929 $236,105 $80,959 $609,993 
Six Months Ended
June 30, 2025
(In thousands)
Harsco Environmental
Clean Earth
Harsco Rail
Consolidated Totals
Primary Geographical Markets (a):
North America$112,839 $481,513 $67,594 $661,946 
Western Europe202,948 — 50,046 252,994 
Latin America (b)
67,670 — 2,433 70,103 
Asia-Pacific58,392 — 7,837 66,229 
Middle East and Africa50,106 — — 50,106 
Eastern Europe 9,160 — — 9,160 
Total Revenues $501,115 $481,513 $127,910 $1,110,538 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$467,655 $— $— $467,655 
Ecoproducts23,517 — — 23,517 
Environmental systems for aluminum dross and scrap processing9,943 — — 9,943 
Railway track maintenance equipment— — 48,720 48,720 
After-market parts and services; safety and diagnostic technology
— — 47,271 47,271 
Railway contracting services— — 31,919 31,919 
Hazardous waste processing solutions— 409,177 — 409,177 
Soil and dredged materials processing and reuse solutions— 72,336 — 72,336 
Total Revenues$501,115 $481,513 $127,910 $1,110,538 
Six Months Ended
June 30, 2024
(In thousands)
Harsco Environmental
Clean Earth
Harsco Rail
Consolidated Totals
Primary Geographical Markets (a):
North America$168,237 $462,135 $97,475 $727,847 
Western Europe219,895 — 40,024 259,919 
Latin America (b)
84,201 — 2,958 87,159 
Asia-Pacific57,260 — 15,670 72,930 
Middle East and Africa53,531 — — 53,531 
Eastern Europe 8,924 — — 8,924 
Total Revenues$592,048 $462,135 $156,127 $1,210,310 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$511,813 $— $— $511,813 
Ecoproducts70,527 — — 70,527 
Environmental systems for aluminum dross and scrap processing9,708 — — 9,708 
Railway track maintenance equipment— — 60,436 60,436 
After-market parts and services; safety and diagnostic technology
— — 66,007 66,007 
Railway contracting services— — 29,684 29,684 
Hazardous waste processing solutions— 386,784 — 386,784 
Soil and dredged materials processing and reuse solutions— 75,351 — 75,351 
Total Revenues$592,048 $462,135 $156,127 $1,210,310 
(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 Current portion of advances on contracts 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 Current portion of contract 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. These instances are primarily related to Rail.

The Company had contract assets totaling $88.0 million and $97.2 million at June 30, 2025 and December 31, 2024, respectively. The Company had advances on contracts totaling $6.6 million and $23.9 million at June 30, 2025 and December 31, 2024, respectively. The decrease in advances on contracts is due principally to recognition of revenue on previously received advances on contracts in excess of receipts of new advances on contracts during the period. During the three and six months ended June 30, 2025, the Company recognized $4.8 million and $22.4 million, respectively, of revenue related to amounts previously included in advances on contracts. During the three and six months ended June 30, 2024, the Company recognized revenues of $9.8 million and $20.5 million, respectively, related to amounts previously included in advances on contracts.

The table below represents the expected fulfillment year of Company's fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year, by segment, and excludes any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year:
(In thousands)
Harsco
Environmental
Harsco
Rail
2026$17,985 $46,156 
202717,082 29,639 
202814,097 15,837 
20299,386 3,845 
20304,143 2,512 
Thereafter
4,866 — 
Total remaining performance obligations
$67,559 $97,989 
Rail is currently manufacturing highly-engineered equipment under significant long-term fixed-price contracts with SBB, Network Rail, and Deutsche Bahn. As previously disclosed, the Company has recognized estimated forward loss provisions related to these contracts due to several factors, such as material and labor cost inflation, supply chain delays, the bankruptcy of key vendors, increased engineering efforts and project delays.

For the Network Rail contract, the Company recorded an additional loss provision of $10.2 million for the three months ended June 30, 2025, primarily related to increased estimated manufacturing and material costs. For the six months ended June 30, 2025, the forward loss provision totaled $11.3 million. The Company recorded an additional loss provision of $2.0 million in the second quarter of 2024 primarily related to costs for redesign and increased manufacturing costs.

For the Deutsche Bahn contract, no adjustment was made to the forward loss provision during the three months ended June 30, 2025. During the six months ended June 30, 2025, the Company recorded a net favorable adjustment of $13.3 million that was the result of an amendment to the contract with Deutsche Bahn which included additional pricing, as well as an extension of the delivery schedule for the machines which resulted in a reduction of the previous estimate of penalties. The increased pricing and reduction of penalties were recorded as an increase to revenue. Partially offsetting this were higher estimated material, manufacturing and engineering costs. During the second quarter of 2024, the Company recorded an additional loss provision of $7.2 million related to supplier price increases, challenges with supplier quality on key components and increased engineering efforts that exceeded previous estimates.

For the SBB contract, during the three months ended June 30, 2025, the Company recorded an additional loss provision of $4.8 million due to higher estimated commissioning, manufacturing, assembly, and logistics costs due as progress was made towards prototype commissioning of the universal vehicle during the quarter. For the six months ended June 30, 2025, the forward loss provision totaled $5.9 million. The Company recognized a $0.2 million loss provision for this contract during the six months ended June 30, 2024.

The estimated forward loss provisions represent the Company's best estimate based on currently available information. It is possible that the Company's overall estimate of liquidated damages, penalties and costs to complete these contracts may change, which could result in an additional estimated forward loss provision at such time that could be material. The Company will continue to update its estimates to complete these contracts, which will include the effect of negotiations with the customers regarding price increases, change orders and extensions to delivery schedules. To that extent, the Company is currently in discussions with Network Rail and has sent Network Rail a letter communicating the need to bring the negotiations to closure and summarizing various options, including a substantial revision of the contract’s economic terms or finding a mutually acceptable exit to this contract. If the Company were to exit this contract, it could result in a material loss in that period.

As of June 30, 2025, the contracts with Network Rail, Deutsche Bahn and SBB are 66%, 52% and 91% complete, respectively, based on costs incurred under the cost-to-cost method to measure progress.

The Company provides assurance type warranties primarily for product sales at Rail. 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.