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Dividends (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jul. 17, 2014
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Mar. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
dividend
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dividends [Abstract]                          
Number of special cash dividends declared and paid | dividend                       1  
Schedule Of Dividends Paid Table [Line Items]                          
Per common share (in dollars per share) | $ / shares   $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.75 $ 2.75 $ 0.75 $ 0.75   $ 2.00 $ 5.00 $ 14.25
Total dividends paid                     $ 173.7 $ 434.2 $ 1,237.3
Total dividends paid per common share (in dollars per share) | $ / shares                     $ 2.00 $ 5.00  
Amount paid to IEP                          
Schedule Of Dividends Paid Table [Line Items]                          
Total dividends paid                     $ 142.4 $ 356.0  
Amounts paid to public stockholders                          
Schedule Of Dividends Paid Table [Line Items]                          
Total dividends paid                     $ 31.3 $ 78.2  
Quarterly                          
Schedule Of Dividends Paid Table [Line Items]                          
Total amount paid     $ 43.4 $ 43.4 $ 43.4 $ 43.4 $ 65.1 $ 65.1 $ 65.1 $ 65.1      
Per common share (in dollars per share) | $ / shares     $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.75 $ 0.75 $ 0.75 $ 0.75      
Shares outstanding (in shares) | shares     86.8 86.8 86.8 86.8 86.8 86.8 86.8 86.8   86.8 86.8
Quarterly | Amount paid to IEP                          
Schedule Of Dividends Paid Table [Line Items]                          
Total amount paid     $ 35.6 $ 35.6 $ 35.6 $ 35.6 $ 53.4 $ 53.4 $ 53.4 $ 53.4      
Quarterly | Amounts paid to public stockholders                          
Schedule Of Dividends Paid Table [Line Items]                          
Total amount paid     $ 7.8 $ 7.8 $ 7.8 $ 7.8 $ 11.7 $ 11.7 $ 11.7 $ 11.7      
Special                          
Schedule Of Dividends Paid Table [Line Items]                          
Total amount paid $ 173.7                        
Per common share (in dollars per share) | $ / shares $ 2.00                        
Shares outstanding (in shares) | shares 86.8                        
Special | Amount paid to IEP                          
Schedule Of Dividends Paid Table [Line Items]                          
Total amount paid $ 142.4                        
Special | Amounts paid to public stockholders                          
Schedule Of Dividends Paid Table [Line Items]                          
Total amount paid $ 31.3