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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 |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) $ / MMBTU | Dec. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) | Apr. 06, 2011 USD ($)
Basis of Presentation [Line Items] |  |  |  |
Deferred Finance Costs, Net | $ 100.2 |  | $ 102.9 |
Asset Impairment Charges | 63.2 | $ 249.8 |  |
Impairment of Proved Oil and Gas Properties | 54.4 | 190.0 |  |
Energy Segment [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Asset Impairment Charges | $ 54.4 | $ 190.0 |  |
FGL [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 19.60% |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity | $ 41.9 |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Unassigned Balance Netted Against Additional Paid in Capital |  |  |  | $ 806.0
Raven Re [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 220.0 |  | 226.3 |
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus | 4.1 |  | 2.5 |
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus | 13.7 |  | 33.1 |
Statutory Accounting Practices, Statutory Capital and Surplus, Change in Permitted Practice to Non-Permitted, Balance | $ 210.3 |  | $ 195.6 |
Natural Gas [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Average Sales Prices | $ / MMBTU | 2.59 |  |  |
Accounting Standards Update 2015-17 [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Deferred Tax Assets, Net | $ 39.1 |  |  |

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