XML 69 R39.htm IDEA: XBRL DOCUMENT v3.10.0.1
Prepaid expenses and other (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Prepaid expenses and other    
Gold bullion $ 21.9 $ 14.6
Inventory 3.4 7.1
Prepaid expenses 19.5 17.0
Debt issue costs 0.7 0.7
Prepaid expenses and other $ 45.5 $ 39.4