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Debt (Guarantees) (Details) £ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Guarantee | Dec. 31, 2020 GBP (£) Guarantee | Dec. 31, 2020 AUD ($) Guarantee | Dec. 31, 2020 ZAR (R) Guarantee
Debt Instrument [Line Items] |  |  |  |
Variable interest entity ownership percentage in joint venture | 50.00% |  |  |
GEO Amey |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Lines of credit | £ |  | £ 12.0 |  |
Ravenhall |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | Guarantee | 7 | 7 | 7 | 7
Letters of guarantee outstanding relating to performance guarantees | $ 10,300,000 |  |  |
Ravenhall | Letter of credit | Revolver |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum exposure, undiscounted | 45,500,000 |  | $ 59,000,000 |
SACS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum loan amount under stand by facility to SACS | 1,400,000 |  |  | R 20,000,000.0
Line of credit facility, amount outstanding | $ 0 |  |  |

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- Definition Maximum loan amount under SACS shareholder's loan. + References No definition available. + Details
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- Definition Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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