Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Cost	$ 12,868.5	$ 12,083.9
Accumulated depreciation and amortization	(5,479.6)	(5,067.1)
Property, plant and equipment, net	7,388.9	7,016.8
Mining properties, mine development costs, mine plant facilities and mineral interests	6,344.5	6,021.3
Asset retirement costs	119.3	112.3
Other non-mining assets	925.1	883.2
Cumulative capitalized interest, net of amortization	130.6	122.3
Tarkwa Mine
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	13.5	14.4
Cerro Corona
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	71.6	75.4
South Africa
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	$ 45.5	$ 32.5

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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