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Debt - Guarantees (Details) $ in Millions | Mar. 31, 2019 AUD ($) guarantee | Mar. 31, 2019 ZAR (R) guarantee | Mar. 31, 2019 USD ($) guarantee
--- | --- | --- | ---
Ravenhall |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | guarantee | 9 | 9 | 9
Letters of credit outstanding relating to performance guarantees |  |  | $ 12,300,000
Ravenhall | Letter of Credit | Revolver |  |  |
Line of Credit Facility [Line Items] |  |  |
Guaranteed obligations | $ 100.0 |  | 71,000,000
SACS |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum loan amount under standby facility |  | R 20,000,000 | 1,400,000.0
Amount funded |  |  | $ 0

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