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Dividends (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended
Nov. 18, 2013
Aug. 19, 2013
Jun. 10, 2013
May 17, 2013
Feb. 19, 2013
Dec. 31, 2013
dividend
Jan. 24, 2013
Dividends [Abstract]              
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  
Schedule Of Dividends Paid Table [Line Items]              
Special dividends paid     $ 564.4   $ 477.6    
Quarterly dividends paid 65.1 65.1   65.1      
Total dividends paid           1,237.3  
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   $ 0.75      
Total dividends paid per common share (in dollars per share)           $ 14.25  
Shares outstanding (in shares) 86,800,000 86,800,000 86,800,000 86,800,000 86,800,000    
IEP
              
Schedule Of Dividends Paid Table [Line Items]              
Special dividends paid     462.8   391.6    
Quarterly dividends paid 53.4 53.4   53.4      
Total dividends paid           1,014.6  
Public stockholders
              
Schedule Of Dividends Paid Table [Line Items]              
Special dividends paid     101.6   86.0    
Quarterly dividends paid 11.7 11.7   11.7      
Total dividends paid           $ 222.7