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Basis of Presentation, Significant Accounting Polices and Practicies and Recent Accounting Pronouncements Basis of Presentation - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
$ / MMBTU
Mar. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Basis of Presentation [Line Items]          
Document Period End Date     Mar. 31, 2016    
Deferred Finance Costs, Net $ 96.8   $ 96.8   $ 102.9
Asset Impairment Charges 27.6 $ 214.6 90.8 $ 464.4  
Impairment of Proved Oil and Gas Properties     75.6 336.6  
Energy Segment [Member]          
Basis of Presentation [Line Items]          
Asset Impairment Charges $ 21.2 $ 146.6 $ 75.6 $ 336.6  
FGL [Member]          
Basis of Presentation [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 19.60%   19.60%    
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity $ 41.6   $ 41.6    
Raven Re [Member]          
Basis of Presentation [Line Items]          
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 213.8   213.8   226.3
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus 2.8   2.8   2.5
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus 7.2   7.2   33.1
Statutory Accounting Practices, Statutory Capital and Surplus, Change in Permitted Practice to Non-Permitted, Balance 209.4   $ 209.4   $ 195.6
Natural Gas [Member]          
Basis of Presentation [Line Items]          
Average Sales Prices | $ / MMBTU     2.40    
Accounting Standards Update 2015-17 [Member]          
Basis of Presentation [Line Items]          
Deferred Tax Assets, Net $ 39.1   $ 39.1    
Goodwill [Member]          
Basis of Presentation [Line Items]          
Goodwill, Purchase Accounting Adjustments     $ 2.6