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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

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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