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Basis of Presentation, Significant Accounting Polices and Practicies and Recent Accounting Pronouncements Basis of Presentation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jan. 13, 2017 | Sep. 30, 2016
Basis of Presentation [Line Items] |  |  |  |
Earnings Per Share, Diluted | $ 1.06 | $ (0.17) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 1.19 | (0.06) |  |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.13) | (0.11) |  |
Earnings Per Share, Basic | 1.06 | (0.17) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | 1.19 | (0.06) |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.13) | $ (0.11) |  |
Net Income (Loss) Attributable to Parent | $ 212.2 | $ (33.9) |  |
Less: Net income attributable to noncontrolling interest | 48.6 | 40.9 |  |
Net income | 260.8 | 7.0 |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 258.8 | (2.5) |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | 2.0 | 9.5 |  |
Income tax expense (benefit) | $ 25.4 | $ (5.6) |  |
Document Period End Date | Dec. 31, 2016 |  |  |
Deferred Finance Costs, Net | $ 82.2 |  |  | $ 87.0
FGL [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 19.50% |  |  |
Raven Re [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 195.0 |  |  | 201.3
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus | 4.0 |  |  | 4.2
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus | (8.3) |  |  | (4.6)
Statutory Accounting Practices, Statutory Capital and Surplus, Change in Permitted Practice to Non-Permitted, Balance | $ 207.3 |  |  | $ 210.0
Secured Debt [Member] | Subsequent Event [Member] | Margin Loan, due July 13, 2018 [Member] |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 150.0 |

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