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Gold Bullion, Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Gold Bullion, Prepaid Expenses and Other Current Assets    
Gold bullion $ 36.7 $ 28.1
Prepaid expenses 26.1 22.1
Stream ounces inventory 0.5 0.1
Debt issue costs 0.5 0.6
Gold bullion, prepaid expenses and other current assets $ 63.8 $ 50.9