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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 | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016 | Jan. 13, 2017
Basis of Presentation [Line Items] |  |  |  |  |  |
Earnings Per Share, Diluted | $ 0.01 | $ (0.66) | $ 0.66 | $ (0.95) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 0.02 | (0.93) | 0.82 | (1.17) |  |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.01) | 0.27 | (0.16) | 0.22 |  |
Earnings Per Share, Basic | 0.01 | (0.67) | 0.66 | (0.97) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | 0.02 | (0.94) | 0.82 | (1.19) |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.01) | $ 0.27 | $ (0.16) | $ 0.22 |  |
Net Income (Loss) Attributable to Parent | $ 2.1 | $ (132.9) | $ 132.2 | $ (191.5) |  |
Less: Net income attributable to noncontrolling interest | 37.7 | 39.9 | 117.0 | 121.4 |  |
Net income (loss) | 39.8 | (93.0) | 249.2 | (70.1) |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 7.7 | (185.5) | 195.4 | (222.6) |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | 32.1 | 92.5 | 53.8 | 152.5 |  |
Income tax expense (benefit) | 24.8 | $ (2.2) | $ 87.4 | $ (4.5) |  |
Document Period End Date |  |  | Jun. 30, 2017 |  |  |
Deferred Finance Costs, Net | 79.8 |  | $ 79.8 |  | $ 87.0 |
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity | $ 28.8 |  | $ 28.8 |  |  |
FGL [Member] |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 19.60% |  | 19.60% |  |  |
Raven Re [Member] |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 115.0 |  | $ 115.0 |  | 201.3 |
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus | 5.7 |  | 5.7 |  | 4.2 |
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus | 18.7 |  | 18.7 |  | (4.6) |
Statutory Accounting Practices, Statutory Capital and Surplus, Change in Permitted Practice to Non-Permitted, Balance | $ 102.0 |  | 102.0 |  | 210.0 |
Net Periodic Benefit Cost [Member] |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  | 7.8 |  | 4.8 |
Defined Benefit Plan, Service Cost |  |  | 4.3 |  | 3.3 |
Defined Benefit Plan, Other Costs |  |  | $ 3.5 |  | $ 1.5 |
Secured Debt [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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