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Revenue Recognition
 12 Months Ended
Dec. 31, 2020
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. See Note 1, Summary of Significant Accounting Policies, Revenue Recognition, for additional information.
A summary of the Company's revenues by primary geographical markets as well as by key product and service groups is as follows:
Twelve Months Ended
December 31, 2020
(In thousands)Harsco
Environmental Segment		Harsco
Clean Earth Segment		Harsco
Rail
Segment		CorporateConsolidated Totals
Primary Geographical Markets (a)(b):
North America$249,904 $619,588 $217,638 $— $1,087,130 
Western Europe377,066 — 78,549 — 455,615 
Latin America (c)
119,457 — 7,098 — 126,555 
Asia-Pacific87,608 — 26,546 — 114,154 
Middle East and Africa63,427 — — — 63,427 
Eastern Europe 16,983 — — — 16,983 
Total Revenues $914,445 $619,588 $329,831 $— $1,863,864 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing; and related logistical services$781,060 $— $— $— $781,060 
Applied products120,432 — — — 120,432 
Environmental systems for aluminum dross and scrap processing12,953 — — — 12,953 
Railway track maintenance equipment— — 184,076 — 184,076 
After-market parts and services; safety and diagnostic technology— — 116,600 — 116,600 
Railway contracting services— — 29,155 — 29,155 
Waste processing and reuse solutions— 619,588 — — 619,588 
Total Revenues$914,445 $619,588 $329,831 $— $1,863,864 
Twelve Months Ended
December 31, 2019
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth Segment		Harsco
Rail
Segment		CorporateConsolidated Totals
Primary Geographical Markets (a)(b):
North America$294,367 $169,522 $221,724 $— $685,613 
Western Europe386,593 — 44,569 — 431,162 
Latin America (c)
146,040 — 2,588 — 148,628 
Asia-Pacific128,949 — 30,492 — 159,441 
Middle East and Africa60,402 — — — 60,402 
Eastern Europe 18,496 — — — 18,496 
Total Revenues$1,034,847 $169,522 $299,373 $— $1,503,742 
Twelve Months Ended
December 31, 2019
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth Segment		Harsco
Rail
Segment		CorporateConsolidated Totals
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing; and related logistical services$888,850 $— $— $— $888,850 
Applied products127,875 — — — 127,875 
Environmental systems for aluminum dross and scrap processing18,122 — — — 18,122 
Railway track maintenance equipment— — 145,968 — 145,968 
After-market parts and services; safety and diagnostic technology— — 132,249 — 132,249 
Railway contracting services— — 21,156 — 21,156 
Waste processing and reuse solutions— 169,522 — — 169,522 
Total Revenues$1,034,847 $169,522 $299,373 $— $1,503,742 
Twelve Months Ended
December 31, 2018
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth Segment		Harsco
Rail
Segment		CorporateConsolidated Totals
Primary Geographical Markets (b):
North America$302,238 $— $205,212 $74 $507,524 
Western Europe390,840 — 48,016 — 438,856 
Latin America (c)
151,886 — 3,977 — 155,863 
Asia-Pacific145,761 — 22,089 — 167,850 
Middle East and Africa50,003 — — — 50,003 
Eastern Europe 27,576 — — — 27,576 
Total Revenues$1,068,304 $— $279,294 $74 $1,347,672 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services$927,969 $— $— $— $927,969 
Applied products128,488 — — — 128,488 
Environmental systems for aluminum dross and scrap processing11,847 — — — 11,847 
Railway track maintenance equipment— — 112,547 — 112,547 
After-market parts and services; safety and diagnostic technology— — 139,020 — 139,020 
Railway contracting services— — 27,727 — 27,727 
General Corporate— — — 74 74 
Total Revenues$1,068,304 $— $279,294 $74 $1,347,672 
(a)     The Company acquired ESOL in 2020 and Clean Earth in 2019. The results of both are included in the Harsco Clean Earth Segment. The operating results of the former Harsco Industrial Segment have been reflected as discontinued operations in the Company's Consolidated Statements of Operations. See Note 3, Acquisition 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 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 Consolidated Balance Sheets. Contract assets are transferred to Trade accounts receivable, net, when 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 $60.1 million at December 31, 2020 and $31.2 million at December 31, 2019. The increase is due principally to additional contract assets recognized in excess of the transfer of contract assets to accounts receivable. The Company had Advances on contracts totaling $84.9 million at December 31, 2020 and $60.3 million at December 31, 2019. The increase is due principally to the receipts of new advances on contracts in excess of the recognition of revenue on previously received advances on contracts during the period, primarily in the Harsco Rail Segment. During the year ended December 31, 2020, the Company recognized approximately $75 million of revenue related to amounts previously included in Advances on Contracts.
At December 31, 2020, the Harsco Environmental Segment had remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year totaling $84.1 million. Of this amount, $24.8 million is expected to be fulfilled by December 31, 2021, $19.8 million by December 31, 2022, $14.2 million by December 31, 2023, $13.7 million by December 31, 2024 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 December 31, 2020, the Harsco Rail Segment had remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year totaling $317.5 million. Of this amount, $117.2 million is expected to be fulfilled by December 31, 2021, $117.2 million by December 31, 2022, $62.4 million by December 31, 2023, $17.1 million by December 31, 2024 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 the federal railway system of Switzerland ("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 December 31, 2020 and 2019 the entire remaining estimated forward loss provision of $4.4 million and $6.4 million, respectively, is included in the caption Other current liabilities on the 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 $38.6 million, $23.4 million and $24.2 million of revenues for the contracts with SBB, on an over time basis, utilizing a cost-to-cost method for the years ended December 31, 2020, 2019 and 2018, respectively. The Company has substantially completed the first contract and is approximately 70% complete on the second contract with SBB as of December 31, 2020.

The Company is currently manufacturing seven multipurpose Stoneblower machines for the U.K.-based customer Network Rail under a long-term contract. Delivery of these machines have been delayed due to several factors, including customer expectations and requirements and COVID-19, and the Company's estimated delivery schedule would trigger liquidated damages. However, based on the nature of these delays and negotiations with the customer, the Company expects that it will get relief from the customer for most of these liquidated damages, and as such the Company's current estimate of contract revenues has not been reduced. However, if the Company is not granted relief, any adjustment to the estimate of these liquidated damages in the future could have a material impact on the Company’s results of operations in that period.
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. See Note 1, Summary of Significant Accounting Policies for additional information on warranties.