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Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory [Line Items]    
Ore stockpiles $ 88.0 $ 76.5
Gold in-process 43.1 29.7
Consumable stores 269.9 295.2
Other 1.7 0.7
Inventories $ 402.7 $ 402.1