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Gold Bullion, Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Gold Bullion, Prepaid Expenses and Other Current Assets |  |
Gold bullion | $ 51.3 | $ 28.1
Prepaid expenses | 30.0 | 22.1
Stream ounces inventory | 0.5 | 0.1
Debt issue costs | 0.6 | 0.6
Gold bullion, prepaid expenses and other current assets | $ 82.4 | $ 50.9

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