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Earnings Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended			1 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 31, 2012
Earnings Per Share [Abstract]
Net income attributable to CVR Energy stockholders									$ 173.9	$ 370.7	$ 378.6
Weighted-average number of shares of common stock outstanding	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000
Effect of dilutive securities:
Non-vested restricted shares									0	0	600,000
Weighted-average number of shares of common stock outstanding assuming dilution	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	86,800,000	87,400,000
Basic earnings per share (in dollars per share)	$ (0.51)us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.96us-gaap_EarningsPerShareBasic	$ 1.46us-gaap_EarningsPerShareBasic	$ (0.25)us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 2.11us-gaap_EarningsPerShareBasic	$ 1.90us-gaap_EarningsPerShareBasic	$ 2.00us-gaap_EarningsPerShareBasic	$ 4.27us-gaap_EarningsPerShareBasic	$ 4.36us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ (0.51)us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.96us-gaap_EarningsPerShareDiluted	$ 1.46us-gaap_EarningsPerShareDiluted	$ (0.25)us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 2.11us-gaap_EarningsPerShareDiluted	$ 1.90us-gaap_EarningsPerShareDiluted	$ 2.00us-gaap_EarningsPerShareDiluted	$ 4.27us-gaap_EarningsPerShareDiluted	$ 4.33us-gaap_EarningsPerShareDiluted
CVR Energy Long Term Incentive Plan \| Stock Options
Antidilutive securities
Number of options exercised											22,900	22,900
CVR Energy Long Term Incentive Plan \| Stock Options \| CVR Energy Long Term Incentive Plan
Antidilutive securities
Number of options exercised												22,900