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Pre-Tax (Loss)/Income from Continuing Operations Before Impairment of Investments in Equity Investees and Share of Equity Investees' Share of Losses and Discontinued Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Income before tax, impairment of investment in equity investee and share of equity investees' losses	$ (79.1)	$ 108.2	$ (162.5)
South Africa
Income Taxes [Line Items]
Income before tax, impairment of investment in equity investee and share of equity investees' losses	(61.5)	(110.9)	(348.7)
Ghana
Income Taxes [Line Items]
Income before tax, impairment of investment in equity investee and share of equity investees' losses	22.9	46.5	(96.9)
Australia
Income Taxes [Line Items]
Income before tax, impairment of investment in equity investee and share of equity investees' losses	178.0	117.9	111.0
Peru
Income Taxes [Line Items]
Income before tax, impairment of investment in equity investee and share of equity investees' losses	(61.4)	109.0	153.4
British Virgin Islands
Income Taxes [Line Items]
Income before tax, impairment of investment in equity investee and share of equity investees' losses	$ (157.1)	$ (54.3)	$ 18.7

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- Definition

Income Taxes [Line Items]

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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