Related Party Transactions - Icahn Enterprises (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Related Party Transaction [Line Items]
Amount paid to IEP	$ 35.6	$ 35.6	$ 35.6	$ 106.8
Amounts paid to public stockholders	7.8	7.8	7.8	23.4
Total amount paid	$ 43.4	$ 43.4	$ 43.4	$ 130.2
Per common share (in dollars per share)	$ 0.50	$ 0.50	$ 0.50	$ 1.50
Shares outstanding (in shares)	86.8	86.8	86.8
IEP Energy LLC
Related Party Transaction [Line Items]
Ownership percentage held by controlling stockholder				82.00%

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