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Prepaid expenses and other (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Prepaid expenses and other |  |
Gold bullion | $ 21.9 | $ 14.6
Inventory | 3.4 | 7.1
Prepaid expenses | 19.5 | 17.0
Debt issue costs | 0.7 | 0.7
Prepaid expenses and other | $ 45.5 | $ 39.4

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