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Dividends (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended
Aug. 19, 2013
Jun. 10, 2013
May 17, 2013
Feb. 19, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
dividend
Sep. 30, 2012
Jan. 24, 2013
Dividends                  
Initial quarterly dividend expected (in dollars per share)                 $ 0.75
Dividend expected on annualized basis (in dollars per share)                 $ 3.00
Number of special cash dividends declared and paid             2    
Dividends                  
Special dividends paid   $ 564.4   $ 477.6          
Quarterly dividends paid 65.1   65.1            
Total dividends paid             1,172.2    
Special dividends paid per common share (in dollars per share)   $ 6.50   $ 5.50          
Quarterly dividends paid per common share (in dollars per share) $ 0.75   $ 0.75            
Total dividends paid per common share (in dollars per share)             $ 13.5    
Shares outstanding 86.8 86.8 86.8 86.8 86.8 86.8 86.8 86.8  
IEP
                  
Dividends                  
Special dividends paid   462.8   391.6          
Quarterly dividends paid 53.4   53.4            
Total dividends paid             961.2    
Public stockholders
                  
Dividends                  
Special dividends paid   101.6   86.0          
Quarterly dividends paid 11.7   11.7            
Total dividends paid             $ 211.0