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Prepaid expenses and other current assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Prepaid expenses and other current assets. |  |
Gold bullion | $ 18.6 | $ 26.2
Prepaid expenses | 16.4 | 17.5
Stream ounces inventory | 0.5 | 4.4
Debt issue costs | 0.6 | 0.7
Prepaid expenses and other current assets | $ 36.1 | $ 48.8

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