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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Nov. 17, 2017
Oct. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]            
Dividends declared (in dollars per share)     $ 0.5 $ 0.5 $ 1.5 $ 1.5
Dividends declared         $ 130.2  
Forecast            
Subsequent Event [Line Items]            
Proceeds from distribution $ 91.5          
IEP Energy LLC            
Subsequent Event [Line Items]            
Ownership percentage held by controlling stockholder         82.00%  
Subsequent Event            
Subsequent Event [Line Items]            
Dividends declared (in dollars per share)   $ 0.50        
Dividends declared   $ 43.4        
Distributions declared (in dollars per unit)   $ 0.94        
Distributions declared   $ 138.7        
Subsequent Event | Midway Pipeline LLC            
Subsequent Event [Line Items]            
Ownership percentage in joint venture   50.00%        
Subsequent Event | IEP Energy LLC | IEP Energy LLC            
Subsequent Event [Line Items]            
Dividends declared   $ 35.6        
Ownership percentage held by controlling stockholder   82.00%