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Income and Mining Tax Expense (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Current income and mining taxes | $ (134.2)us-gaap_CurrentIncomeTaxExpenseBenefit | $ (165.1)us-gaap_CurrentIncomeTaxExpenseBenefit | $ (353.9)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income and mining taxes benefit/(expense) | 12.6 us-gaap_DeferredIncomeTaxExpenseBenefit | 59.4 us-gaap_DeferredIncomeTaxExpenseBenefit | (5.5)us-gaap_DeferredIncomeTaxExpenseBenefit
Income and mining tax expense | (121.6)us-gaap_IncomeTaxExpenseBenefit | (105.7)us-gaap_IncomeTaxExpenseBenefit | (359.4)us-gaap_IncomeTaxExpenseBenefit
South Africa |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (0.6)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_ZA | (16.1)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_ZA | (14.5)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_ZA
Deferred income and mining taxes benefit/(expense) | (13.2)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_ZA | 14.2 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_ZA | 24.2 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_ZA
Ghana |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (31.1)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_GH | (40.6)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_GH | (170.6)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_GH
Deferred income and mining taxes benefit/(expense) | 13.5 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_GH | 68.3 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_GH | (36.8)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_GH
Australia |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (41.8)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_AU | (42.1)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_AU | (64.1)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_AU
Deferred income and mining taxes benefit/(expense) | 1.5 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_AU | 1.0 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_AU | (4.8)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_AU
Peru |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (60.7)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_PE | (66.3)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_PE | (104.7)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_PE
Deferred income and mining taxes benefit/(expense) | $ 10.8 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_PE | $ (24.1)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_PE | $ 11.9 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_PE

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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