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Prepaid expenses and other current assets (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Prepaid expenses and other current assets.    
Gold bullion $ 20.0 $ 26.2
Prepaid expenses 22.7 17.5
Stream ounces inventory 0.5 4.4
Debt issue costs 0.6 0.7
Prepaid expenses and other current assets $ 43.8 $ 48.8