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Derivative Financial Instruments - Schedule of Loss on Derivatives and Current Period Settlements (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Current period settlement on derivative contracts									$ (16.6)	$ 36.4	$ (26.0)
Loss on derivatives, net	$ (65.0)	$ (17.0)	$ 0.0	$ 12.2	$ (14.6)	$ (1.7)	$ (1.9)	$ (1.2)	$ (69.8)	$ (19.4)	$ (28.6)

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- Definition

Derivative, Settlement on Derivative Asset (Liability) Contract

+ References

No definition available.

+ Details

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Namespace Prefix:	cvi_
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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- References

No definition available.

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