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Prepaid expenses and other current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Prepaid expenses and other current assets.    
Gold bullion $ 32.4 $ 18.6
Prepaid expenses 18.8 16.4
Stream ounces inventory 0.5 0.5
Debt issue costs 0.9 0.6
Prepaid expenses and other current assets $ 52.6 $ 36.1