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Inventories (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010
--- | --- | --- | ---
Inventory Disclosure [Line Items] |  |  |
Ore stockpiles | $ 63.7 | $ 57.8 | $ 61.1
Gold in-process | 26.9 | 31.5 | 33.7
Consumable stores | 205.5 | 156.4 | 134.3
Other | 1.6 | 10.6 | 5.8
Inventories | $ 297.7 | $ 256.3 | $ 234.9

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