Summary of Results of Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Product sales	$ 310.7	$ 2,021.2
Costs and expenses	(285.7)	(1,737.8)
Income before tax and share of equity investee's profits	25.0	283.4
Income and mining tax expense	(5.4)	67.5
Income before share of equity investee's profits	19.6	350.9
Share of equity investee's profits	0.9	11.4
Net income	20.5	362.3
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	$ 0	$ 0

The net asset value of a disposal group, including discontinued operations distributed.

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The Net carrying value of a disposal group, including discontinued operations.

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Profit on disposal/distribution of a disposal group, including discontinued operations, calculated as the amount that the selling price/net asset value distributed exceeds the net carrying amount of the disposal group/discontinued operation.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before share of equity investee's profits and extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Other income (loss) amounts, net of tax expense or benefit, relating to a disposal group that is classified as a component of the entity, exclusive of the following elsewhere enumerated categories: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount classified as accounts payable and accrued liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount of costs of goods sold attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount classified as other assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount classified as other liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount classified as prepaid and other assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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