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Inventories (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Inventory [Line Items]
Ore stockpiles	$ 100.7us-gaap_InventoryRawMaterialsNetOfReserves		$ 88.0us-gaap_InventoryRawMaterialsNetOfReserves
Materials contained on heap leach pads	109.0us-gaap_InventoryOreStockpilesOnLeachPads		109.0us-gaap_InventoryOreStockpilesOnLeachPads
Gold in-process	38.5us-gaap_InventoryWorkInProcessNetOfReserves		43.1us-gaap_InventoryWorkInProcessNetOfReserves
Consumable stores	273.2us-gaap_InventorySuppliesNetOfReserves		269.9us-gaap_InventorySuppliesNetOfReserves
Other			1.7us-gaap_OtherInventoryNetOfReserves
Inventories	521.4gfi_InventoryCurrentAndNoncurrent		511.7gfi_InventoryCurrentAndNoncurrent
Current assets	373.3us-gaap_InventoryNet		402.7us-gaap_InventoryNet
Long-term assets	148.1us-gaap_InventoryNoncurrent	[1]	109.0us-gaap_InventoryNoncurrent	[1]
Inventories	$ 521.4gfi_InventoryCurrentAndNoncurrent		$ 511.7gfi_InventoryCurrentAndNoncurrent
[1] This amount relates to materials contained on heap leach pads and ore stockpiles that will only be processed at the end of life of mine.

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Inventory current and noncurrent.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

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Amount before last-in first-out (LIFO) and valuation reserves of ore stockpile material contained on a leach pad, for example, but not limited to, copper or gold ore.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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Carrying amount, net of valuation reserves and allowances, as of the balance sheet date of inventories not otherwise specified in the taxonomy.

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