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Income and Mining Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |
Current income and mining taxes | $ (143.0) | $ (134.2) | $ (165.1)
Deferred income and mining taxes | (12.0) | 12.6 | 59.4
Income and mining tax expense | (155.0) | (121.6) | (105.7)
South Africa |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (3.0) | (0.6) | (16.1)
Deferred income and mining taxes | (0.3) | (13.2) | 14.2
Ghana |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (35.4) | (31.1) | (40.6)
Deferred income and mining taxes | (8.9) | 13.5 | 68.3
Australia |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (71.6) | (41.8) | (42.1)
Deferred income and mining taxes | 14.2 | 1.5 | 1.0
Peru |  |  |
Income Taxes [Line Items] |  |  |
Current income and mining taxes | (33.0) | (60.7) | (66.3)
Deferred income and mining taxes | $ (17.0) | $ 10.8 | $ (24.1)

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