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Debt - Guarantees (Details) - 3 months ended Mar. 31, 2016 £ in Millions, CAD in Millions, AUD in Millions | ZAR | AUD guarantee | CAD guarantee | ZAR guarantee | USD ($) guarantee | 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 | £ |  |  |  |  |  | £ 12.0
Note receivable for GEOAmey |  |  |  |  | $ 12,200,000 | £ 8.5
Ravenhall |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | guarantee |  | 11 | 11 | 11 | 11 | 11
Letters of credit outstanding relating to performance guarantees |  |  |  |  | $ 16,300,000 |
Ravenhall | Letter of Credit | Revolver |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Guaranteed obligations |  | AUD 215.0 |  |  | 164,900,000 |
SACS |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Guaranteed obligations |  |  |  | ZAR 15,000,000 | 1,000,000 |
Remaining guarantee under letter of credit | ZAR | ZAR 15,000,000 |  |  |  |  |
Maximum loan amount under standby facility |  |  |  | ZAR 20,000,000 | 1,347,200.0000 |
Amount funded |  |  |  |  | 0 |
Canada Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Potential estimated exposure of tax obligations |  |  | CAD 1.5 |  | $ 1,200,000 |

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