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Segment Reporting Segment Reporting (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Auramet [Member] | Palmarejo, San Bartolome, Kensington, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 111.7 | $ 94.6 | $ 50.8
Toronto-Dominion Bank [Member] | Palmarejo, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 106.7 | 65.8 | 0
INTL Commodities [Member] | Palmarejo, San Bartolome, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 84.6 | 58.0 | 112.6
China Gold [Member] | Kensington [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 81.5 | 43.8 | 108.9
Valcambi [Member] | Palmarejo, San Bartolome [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 77.2 | 414.4 | 385.5
Mitsui [Member] | Palmarejo, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 70.3 | $ 65.6 | $ 105.1

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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