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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 | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016 | Jan. 13, 2017
Basis of Presentation [Line Items] |  |  |  |  |  |
Earnings Per Share, Diluted | $ (0.41) | $ (0.12) | $ 0.65 | $ (0.29) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | (0.30) | (0.24) | 0.88 | (0.30) |  |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.11) | 0.12 | (0.23) | 0.01 |  |
Earnings Per Share, Basic | (0.41) | (0.12) | 0.65 | (0.30) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | (0.30) | (0.24) | 0.88 | (0.31) |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.11) | $ 0.12 | $ (0.23) | $ 0.01 |  |
Net Income (Loss) Attributable to Parent | $ (82.1) | $ (24.7) | $ 130.1 | $ (58.6) |  |
Less: Net income attributable to noncontrolling interest | 30.7 | 40.6 | 79.3 | 81.5 |  |
Net income | (51.4) | 15.9 | 209.4 | 22.9 |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (54.4) | (47.6) | 204.4 | (50.1) |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | 3.0 | 63.5 | 5.0 | 73.0 |  |
Income tax expense (benefit) | 50.2 | $ (15.4) | $ 75.6 | $ (21.0) |  |
Document Period End Date |  |  | Mar. 31, 2017 |  |  |
Deferred Finance Costs, Net | $ 81.2 |  | $ 81.2 |  | $ 87.0 |
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 | $ 188.8 |  | $ 188.8 |  | 201.3 |
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus | 4.4 |  | 4.4 |  | 4.2 |
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus | (6.8) |  | (6.8) |  | (4.6) |
Statutory Accounting Practices, Statutory Capital and Surplus, Change in Permitted Practice to Non-Permitted, Balance | $ 199.9 |  | 199.9 |  | 210.0 |
Net Periodic Benefit Cost [Member] |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  | 7.9 |  | 4.8 |
Defined Benefit Plan, Service Cost |  |  | 4.3 |  | 3.3 |
Defined Benefit Plan, Other Costs |  |  | $ 3.6 |  | $ 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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