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Segment Results and Assets (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) [2] $ 1,431.4 [1] $ 1,684.9 [1] $ 1,678.7 [3]
Corporate Expenditure [Member]      
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) 20.5 27.3 39.4
Accretion Expense on Provision for Environmental Rehabilitation [Member]      
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) 13.9 15.4 10.4
Employee Termination Costs [Member]      
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) $ 9.4 $ 42.2 $ 35.5
[1] Operating costs (excluding amortization and depreciation) for continuing operations for management reporting purposes includes: Corporate expenditure - $27.3 million, Accretion expense on provision for environmental rehabilitation - $15.4 million and Employee termination costs - $42.2 million, which are not included in production costs under U.S. GAAP. In addition, gold inventory change is included in production costs under U.S. GAAP.
[2] This caption is based on captions used in the IFRS financial statements and does not reflect the US GAAP captions per the consolidated statement of operations.
[3] Operating costs (excluding amortization and depreciation) for continuing operations for management reporting purposes includes: Corporate expenditure - $39.4 million, Accretion expense on provision for environmental rehabilitation - $10.4 million and Employee termination costs - $35.5 million, which are not included in production costs under U.S. GAAP. In addition, gold inventory change is included in production costs under U.S. GAAP.