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Summary of Results of Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Product sales | $ 310.7 | $ 2,021.2 | $ 2,301.0
Costs and expenses | (285.7) | (1,737.8) | (1,797.6)
Income before tax and share of equity investee's profits | 25.0 | 283.4 | 503.4
Income and mining tax expense | (5.4) | 67.5 | (167.5)
Income before share of equity investee's profits | 19.6 | 350.9 | 335.9
Share of equity investee's profits | 0.9 | 11.4 | 4.8
Net income | 20.5 | 362.3 | 340.7
Property, plant and equipment, net | 1,987.3 |  |
Non-current investments | 187.0 |  |
Current assets | 285.4 |  |
Current liabilities | (234.8) |  |
Non-current liabilities | (1,191.2) |  |
Net carrying value | 1,033.7 |  |
Net asset value distributed | (1,033.7) |  |
Profit on distribution |  |  |

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