Income Taxes (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets:
Personnel accruals	$ 1.8	$ 8.8
State tax credit carryforward, net of federal expense	12.6	19.6
Contingent liabilities	0.1	10.3
Other	2.1us-gaap_DeferredTaxAssetsOther	0us-gaap_DeferredTaxAssetsOther
Total gross deferred income tax assets	16.6us-gaap_DeferredTaxAssetsGross	38.7us-gaap_DeferredTaxAssetsGross
Deferred income tax liabilities:
Property, plant, and equipment	(2.7)	(2.0)
Prepaid expenses	(0.3)	(0.4)
Other	(0.1)us-gaap_DeferredTaxLiabilitiesOther	(0.5)us-gaap_DeferredTaxLiabilitiesOther
Total gross deferred income tax liabilities	(648.6)us-gaap_DeferredTaxLiabilities	(612.6)us-gaap_DeferredTaxLiabilities
Net deferred income tax liabilities	(632.0)us-gaap_DeferredTaxAssetsLiabilitiesNet	(573.9)us-gaap_DeferredTaxAssetsLiabilitiesNet
CVR Partners, LP
Deferred income tax liabilities:
Investment in CVR Partners and Refining	(76.1)	(87.6)
CVR Refining, LP
Deferred income tax liabilities:
Investment in CVR Partners and Refining	$ (569.4)	$ (522.1)

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