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Prepaid expenses and other current assets (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Prepaid expenses and other current assets.    
Gold bullion $ 30.4 $ 32.4
Prepaid expenses 16.2 18.8
Stream ounces inventory 0.4 0.5
Debt issue costs 0.9 0.9
Prepaid expenses and other current assets $ 47.9 $ 52.6