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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.

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