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Debt - Guarantees (Details) £ in Millions, CAD in Millions, AUD in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jun. 29, 2016 GBP (£) | Sep. 30, 2016 ZAR | Sep. 30, 2016 AUD guarantee | Sep. 30, 2016 CAD guarantee | Sep. 30, 2016 ZAR guarantee | Sep. 30, 2016 USD ($) guarantee | Sep. 30, 2016 GBP (£) 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 |  |  |  |  |  | $ 5,800,000 | £ 4.5
Repayments of debt | £ | £ 4.0 |  |  |  |  |  |
Ravenhall |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | guarantee |  |  | 13 | 13 | 13 | 13 | 13
Letters of credit outstanding relating to performance guarantees |  |  |  |  |  | $ 20,100,000 |
Ravenhall | Letter of Credit | Revolver |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Guaranteed obligations |  |  | AUD 215.0 |  |  | 164,100,000 |
SACS |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Guaranteed obligations |  |  |  |  | ZAR 15,000,000 | 1,100,000 |
Remaining guarantee under letter of credit | ZAR |  | ZAR 7,400,000 |  |  |  |  |
Maximum loan amount under standby facility |  |  |  |  | ZAR 20,000,000 | 1,400,000.0 |
Amount funded |  |  |  |  |  | 0 |
Canada Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Potential estimated exposure of tax obligations |  |  |  | CAD 1.5 |  | $ 1,100,000 |

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