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Prepaid expenses and other (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Prepaid expenses and other    
Gold bullion $ 26.1 $ 14.6
Inventory 1.4 7.1
Prepaid expenses 6.7 17.0
Debt issue costs 0.7 0.7
Prepaid expenses and other $ 34.9 $ 39.4