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Related Party Transactions - Icahn Enterprises and XO Communications Services, LLC (Details) - USD ($)
3 Months Ended
Mar. 06, 2017
Mar. 31, 2017
Mar. 31, 2016
Related Party Transaction [Line Items]      
Cash dividend paid (in dollars per share) $ 0.50    
Cash dividends paid $ 43,400,000 $ 43,400,000 $ 43,400,000
IEP Energy LLC      
Related Party Transaction [Line Items]      
Ownership percentage held by controlling stockholder   82.00%  
Cash dividends paid $ 35,600,000    
XO Communications Services, LLC      
Related Party Transaction [Line Items]      
Related party payments   $ 200,000  
Due (to) from related party   $ 0