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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 |  |  |  |

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