XML 94 R59.htm IDEA: XBRL DOCUMENT v3.20.4
Prepaid expenses and other current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Prepaid expenses and other current assets.    
Gold bullion $ 18.6 $ 26.2
Prepaid expenses 16.4 17.5
Stream ounces inventory 0.5 4.4
Debt issue costs 0.6 0.7
Prepaid expenses and other current assets $ 36.1 $ 48.8