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Divestitures Divestitures - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | May 06, 2017 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Document Period End Date | Jun. 30, 2017 |  |  |
FGL [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | $ 162.1 |  |
Discontinued Operation, Tax Effect of Discontinued Operation, Deferred Taxes, Current |  | 90.9 |  |
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation |  | 253.0 |  |
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell | $ 304.8 |  |  | $ (362.8)
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax | $ (58.0) |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  | $ 15.0 |  |
FGL [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Percentage Of Ownership Interest | 80.40% |  | 50.00% |

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