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Debt - Guarantees (Details) £ in Millions, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) guarantee | Sep. 30, 2018 AUD ($) guarantee | Sep. 30, 2018 GBP (£) guarantee | Sep. 30, 2018 ZAR (R) guarantee
Geo Amey |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Ownership percentage in South African Custodial Services Pty. Limited | 50.00% |  |  |
Working capital line of credit issued to GEOAmey | $ 15,600,000 |  | £ 12.0 |
Note receivable for GEOAmey | $ 1,700,000 |  | £ 1.3 |
Ravenhall |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | guarantee | 10 | 10 | 10 | 10
Letters of credit outstanding relating to performance guarantees | $ 14,700,000 |  |  |
Ravenhall | Letter of Credit | Revolver |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Guaranteed obligations | 72,200,000 | $ 100.0 |  |
SACS |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum loan amount under standby facility | 1,500,000.0 |  |  | R 20,000,000
Amount funded | $ 0 |  |  |

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