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Basis of Presentation, Significant Accounting Polices and Practicies and Recent Accounting Pronouncements - Basis of Presentation (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
$ / MMBTU
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Apr. 06, 2011
USD ($)
Basis of Presentation [Line Items]              
Asset Impairment Charges $ 113.9 $ (0.3) $ 613.4 $ 82.5      
Impairment of Proved Oil and Gas Properties     439.4 81.0      
Energy Segment [Member]              
Basis of Presentation [Line Items]              
Asset Impairment Charges $ 102.8   $ 439.4        
Impairment of Proved Oil and Gas Properties       $ 81.0      
FGL [Member]              
Basis of Presentation [Line Items]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 19.30%   19.30%        
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity         $ 19.7    
Statutory Accounting Practices, Statutory Capital and Surplus, Unassigned Balance Netted Against Additional Paid in Capital             $ 805.8
Raven Re [Member]              
Basis of Presentation [Line Items]              
Statutory Accounting Practices, Statutory Capital and Surplus, Balance $ 232.5   $ 232.5     $ 251.3  
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus 8.1   8.1     18.8  
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus (48.8)   (48.8)     (81.3)  
Statutory Accounting Practices, Statutory Capital and Surplus, Change in Permitted Practice to Non-Permitted, Balance $ 191.7   $ 191.7     $ 188.8  
Natural Gas [Member]              
Basis of Presentation [Line Items]              
Average Sales Prices | $ / MMBTU     3.39