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Divestitures Divestitures - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Document Fiscal Year Focus | 2017 |  |
Document Period End Date | Dec. 31, 2016 |  |
FGL [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance |  | $ 247.7 |
Discontinued Operation, Tax Effect of Discontinued Operation, Deferred Taxes, Current |  | 90.9 |
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation |  | 338.6 |
Business Acquisition, Termination Fee Payable for Termination of Merger Agreement | $ 51.5 |  |
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell | (218.3) |  | $ (362.8)
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax | $ (144.5) | $ 0.0 |
FGL [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Percentage Of Ownership Interest | 80.50% |  |

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