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Prepaid expenses and other current assets (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid expenses and other current assets. |  |
Gold bullion | $ 23.5 | $ 18.6
Prepaid expenses | 20.4 | 16.4
Stream ounces inventory | 0.9 | 0.5
Debt issue costs | 0.7 | 0.6
Prepaid expenses and other current assets | $ 45.5 | $ 36.1

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