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Subsequent Events - Dividend & Distribution (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 27, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dividend          
Dividends declared per share (in dollars per share)   $ 0.5 $ 0.5 $ 1 $ 1
Dividends declared       $ 86.8  
IEP Energy LLC          
Dividend          
Ownership percentage held by controlling stockholder       82.00%  
Subsequent Event          
Dividend          
Dividends declared per share (in dollars per share) $ 0.5        
Dividends declared $ 43.4        
Subsequent Event | CVR Partners, LP          
Nitrogen Fertilizer Partnership Distribution          
Declared distribution to limited partner (in dollars per share) $ 0.17        
Declared distribution to limited partner $ 19.3        
Expected proceeds from distribution $ 6.6        
Subsequent Event | IEP Energy LLC          
Dividend          
Ownership percentage held by controlling stockholder 82.00%        
Subsequent Event | IEP Energy LLC | IEP Energy LLC          
Dividend          
Dividends declared $ 35.6