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Divestitures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax | $ 0.0 | $ 0.0 | $ 445.9 | $ 0.0 |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 0.7 | (43.6) | 501.5 | 259.2 |
Net income | (36.6) | (51.4) | $ 542.3 | 209.4 |
Document Period End Date |  |  | Mar. 31, 2018 |  |
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down |  | $ 0.0 | $ (445.9) | $ 0.0 |
Front Street RE (Cayman) Ltd. [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell |  |  |  |  | $ (19.0)
Selling Expense |  |  | 65.0 |  |
FGL [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell |  |  |  |  | 402.2
Selling Expense |  |  | 1,518.3 |  |
GBA [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Selling Expense |  |  | 2,000.0 |  |
GBA [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net | 100.0 |  | 100.0 |  |
HGI |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | 441.2 |  | 441.2 |  | $ 703.2
FS Holdco II Ltd. [Domain] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net | $ 26.6 |  | $ 26.6 |  |
FGL [Member] | CF Corporation [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Business Acquisition, Share Price | $ 31.10 |  | $ 31.10 |  |

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