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Business Segments (Details 1) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |  |
Petroleum |  |  |
Segment Reporting Information [Line Items] |  |  |
Intercompany sales | $ 8.7 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember | $ 9.6 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember | $ 9.9 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember
Intercompany cost of product sold (exclusive of depreciation and amortization) | 10.1 cvi_CostOfGoodsSoldToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember | 11.4 cvi_CostOfGoodsSoldToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember | 6.1 cvi_CostOfGoodsSoldToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember
Nitrogen Fertilizer |  |  |
Segment Reporting Information [Line Items] |  |  |
Intercompany sales | 10.1 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember | 11.4 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember | 6.3 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember
Intercompany cost of product sold (exclusive of depreciation and amortization) | 9.2 cvi_CostOfGoodsSoldToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember | 9.8 cvi_CostOfGoodsSoldToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember | 10.2 cvi_CostOfGoodsSoldToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember
Cost of product sold related to the transfer of excess hydrogen | 0 cvi_CostOfGoodsSoldRelatedToExcessTransferToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember | 0.6 cvi_CostOfGoodsSoldRelatedToExcessTransferToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember | 0.2 cvi_CostOfGoodsSoldRelatedToExcessTransferToOtherOperatingSegmentsOfSameEntity / us-gaap_StatementBusinessSegmentsAxis = cvi_NitrogenFertilizerSegmentMember
Hydrogen | Petroleum |  |  |
Segment Reporting Information [Line Items] |  |  |
Intercompany sales | $ 0 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = us-gaap_ProductMember / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember | $ 0.6 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = us-gaap_ProductMember / us-gaap_StatementBusinessSegmentsAxis = cvi_PetroleumSegmentMember |

X
- Definition Represents the cost of goods sold related to excessive transfer to other operating segments of the same entity. + References No definition available. + Details
Name: | cvi_CostOfGoodsSoldRelatedToExcessTransferToOtherOperatingSegmentsOfSameEntity
Namespace Prefix: | cvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the cost of goods sold to other operating segments of the same entity. + References No definition available. + Details
Name: | cvi_CostOfGoodsSoldToOtherOperatingSegmentsOfSameEntity
Namespace Prefix: | cvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cvi_NitrogenFertilizerSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cvi_PetroleumSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |