Income and Mining Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes (Textual) [Abstract]
Unrecognized tax benefit that would impact effective tax rate	16.1	14.3	10.3
Penalties and interest expense	$ 2.9	$ 4.1	$ 2.5
Cumulative Amount of Temporary Differences Related to Investments in Foreign Subsidiaries		$ 81

Cumulative amount of temporary differences related to investments in foreign subsidiaries.

No definition available.

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- Details

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- Definition

The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

Other information relative to a tax position which it is reasonably possible that the total amount of the unrecognized tax benefit will significantly increase or decrease within twelve months of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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