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Prepaid expenses and other (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Prepaid expenses and other    
Gold bullion $ 27.8 $ 14.6
Inventory   7.1
Prepaid expenses 5.4 17.0
Debt issue costs 0.1 0.7
Prepaid expenses and other $ 33.3 $ 39.4