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Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Cost	$ 7,148.2	$ 7,453.4
Accumulated depreciation and amortization	(3,442.5)	(3,000.1)
Property, plant and equipment, net	3,705.6	4,453.3
Cumulative capitalized interest, net of amortization	117.3	110.9
Tarkwa Mine
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	11.3	9.0
Cerro Corona
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	40.4	34.5
South Africa
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	65.6	67.4
Mining Properties, Mine Development Costs, Mine Plant Facilities and Mineral Interest
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	3,226.6	3,807.2
Asset Retirement Costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	84.0	105.7
Other Non-Mining Assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 395.0	$ 540.4

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Cumulative interest incurred in respect of assets requiring a substantial period of time to prepare for their intended future use and are capitalized to the date that the assets are substantially completed.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher SEC
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