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Prepaid expenses and other (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Prepaid expenses and other    
Gold bullion $ 15.7 $ 14.6
Inventory 5.1 7.1
Prepaid expenses 17.7 17.0
Debt issue costs 0.7 0.7
Prepaid expenses and other $ 39.2 $ 39.4