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Carrying Value of Equity Investment in Far South East (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Opening balance	$ 254.4
Share of losses recognized	18.4	63.1	0.8
Closing balance	237.5	254.4
Far Southeast (FSE) Deposit
Schedule of Equity Method Investments [Line Items]
Opening balance	230.0
Investment		230.0
Equity contribution	68.5	50.1
Share of accumulated losses brought forward	(50.1)
Share of losses recognized	(18.4)	(50.1)
Translation
Closing balance	$ 230.0	$ 230.0

X

- Definition

This item represents the entity's accumulated proportionate share of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied brought forward from prior years. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

No definition available.

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- Definition

Reflects the net gain (loss) from converting equity method investment of consolidated entities which are stated in a foreign currency into the currency used in the financial statements.

+ References

No definition available.

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- Definition

This element represents the initial cost of the investment accounted for under the equity method of accounting

+ References

No definition available.

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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-Section 45

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Subparagraph (b)

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- Definition

Gross additions to the investment in and advance to the affiliate.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14.1(b)(3))

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