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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Prepaid Expenses and Other Current Assets.    
Gold bullion $ 28.1 $ 32.4
Prepaid expenses 22.1 18.8
Stream ounces inventory 0.1 0.5
Debt issue costs 0.6 0.9
Prepaid expenses and other current assets $ 50.9 $ 52.6