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Long-Term Debt - Deferred Financing Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Disclosure [Abstract] |  |  |
Amortization of deferred financing costs reported as interest expense and other financing costs | $ 4.8 | $ 3.6 | $ 2.8

X
- Definition The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate and the amortization of the debt discount associated with related debt instruments. + References No definition available. + Details
Name: | cvi_AmortizationOfFinancingCostsAndDiscount
Namespace Prefix: | cvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration