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Derivative Financial Instruments - Schedule of Gains (Losses) on Derivatives and Current Period Settlements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Current period settlements on derivative contracts	$ 13.7	$ 1.2
Gain on derivatives, net	$ 59.3	$ 12.2

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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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Balance Type:	credit
Period Type:	duration

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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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Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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