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Segment Reporting Revenue by Customer (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Mitsui [Member] | Palmarejo, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 133.8 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_MitsuiMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember | $ 70.3 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_MitsuiMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember | $ 65.6 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_MitsuiMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember
TD Bank Group [Member] | Palmarejo, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 106.7 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_TDBankGroupMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember | 106.7 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_TDBankGroupMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember | 65.8 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_TDBankGroupMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember
Standard Bank [Member] | Palmarejo, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 87.5 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_StandardBankMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember | 69.0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_StandardBankMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember | 72.3 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_StandardBankMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoRochesterMember
China Gold [Member] | Kensington [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 86.8 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_ChinaGoldMember / us-gaap_StatementBusinessSegmentsAxis = cde_KensingtonMember | 81.5 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_ChinaGoldMember / us-gaap_StatementBusinessSegmentsAxis = cde_KensingtonMember | 43.8 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_ChinaGoldMember / us-gaap_StatementBusinessSegmentsAxis = cde_KensingtonMember
Johnson Matthey [Member] | San Bartolome [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 71.8 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_JohnsonMattheyMember / us-gaap_StatementBusinessSegmentsAxis = cde_SanBartolomeMember | 66.4 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_JohnsonMattheyMember / us-gaap_StatementBusinessSegmentsAxis = cde_SanBartolomeMember | 1.7 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_JohnsonMattheyMember / us-gaap_StatementBusinessSegmentsAxis = cde_SanBartolomeMember
Valcambi [Member] | Palmarejo San Bartolome [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 33.9 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_ValcambiMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeMember | 77.2 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_ValcambiMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeMember | 414.4 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_ValcambiMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeMember
International Commodities [Member] | Palmarejo San Bartolome Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | 22.4 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_InternationalCommoditiesMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeRochesterMember | 84.6 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_InternationalCommoditiesMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeRochesterMember | 58.0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_InternationalCommoditiesMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeRochesterMember
Auramet [Member] | Palmarejo, San Bartolome, Kensington, Rochester [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 10.8 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_AurametMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeKensingtonRochesterMember | $ 111.7 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_AurametMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeKensingtonRochesterMember | $ 94.6 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cde_AurametMember / us-gaap_StatementBusinessSegmentsAxis = cde_PalmarejoSanBartolomeKensingtonRochesterMember

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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=26872669&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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