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Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Apr. 30, 2014
Subsequent event
Apr. 30, 2014
Subsequent event
Nitrogen Fertilizer Partnership
Apr. 30, 2014
Subsequent event
CVR Refining, LP
Mar. 31, 2014
IEP Energy LLC
Apr. 30, 2014
IEP Energy LLC
Subsequent event
Dividend              
Dividends declared per share (in dollars per share) $ 0.75 $ 5.50 $ 0.75        
Dividends declared $ 65.1   $ 65.1       $ 53.4
Ownership percentage held by controlling stockholder           82.00%  
Distribution              
Declared distribution to limited partner (in dollars per share)       $ 0.38 $ 0.98    
Declared distribution to limited partner       27.8 144.6    
Expected proceeds from distribution       $ 14.8 $ 102.7