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Commitments and Contingencies (Details 6) (EHS, USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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EHS |  |
Estimated future payments for environmental obligations |  |
2015 | $ 0.2 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
2016 | 0.1 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
2017 | 0.1 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
2018 | 0.1 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
2019 | 0.1 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
Thereafter | 0.6 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
Undiscounted total | 1.2 us-gaap_AccrualForEnvironmentalLossContingenciesGross / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
Less amounts representing interest at 2.73% | 0.1 us-gaap_AccrualForEnvironmentalLossContingenciesDiscount / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |
Accrued environmental liabilities at the end of the year | $ 1.1 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember | $ 1.5 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember
Interest rate (as a percent) | 2.06%us-gaap_AccrualForEnvironmentalLossContingenciesDiscountRate / us-gaap_LossContingenciesByNatureOfContingencyAxis = cvi_EnvironmentalHealthAndSafetyMattersMember |

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