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v3.8.0.1

Divestitures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Nov. 08, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | $ 47.3 | $ 36.0 | $ (44.0) | $ 303.1 | $ 60.3 | $ (421.2) | $ 133.4 | $ 126.0 | $ 342.4 | $ (101.5) | $ (194.1) |
Net income (loss) | 24.0 | $ 39.8 | $ (51.4) | $ 260.8 | 36.2 | $ (93.0) | $ 15.9 | $ 7.0 | 273.2 | (33.9) | (512.4) |
Deferred Tax Assets, Valuation Allowance | 946.7 |  |  |  | 532.3 |  |  |  | 946.7 | 532.3 |  |
GBA [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Selling Expense |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  | 19.0 |  |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  |  |  | (19.0) |  |  |
Selling Expense |  |  |  |  |  |  |  |  | 65.0 |  |  |
Compass Production Partners G.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 53.6 | 0.0 |
Net income (loss) |  |  |  |  |  |  |  |  | 0.0 |  | (368.6) |
Gain (Loss) on Disposition of Oil and Gas Property |  |  |  |  |  |  |  |  |  | 105.6 | 0.0 |
FGL [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  |  |  |  | 15.2 |  |  |  |  | 15.2 |  |
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell | 402.2 |  |  |  |  |  |  |  | 402.2 |  |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  |  |  | (39.4) |  | 0.0 |
Selling Expense |  |  |  |  |  |  |  |  | 1,471.3 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  |  |  |  |  |  |  |  |  | 15.2 |  |
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation |  |  |  |  | 367.9 |  |  |  |  | 367.9 |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 75.9 |
Deferred Tax Assets, Valuation Allowance |  |  |  |  | 94.7 |  |  |  |  | 94.7 |  |
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 | 0.0 |  |  |  |  |  |  |  | 0.0 |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 106.0 | (198.8) | $ (556.8) |
Deferred Tax Assets, Valuation Allowance | $ 703.2 |  |  |  | $ 313.1 |  |  |  | $ 703.2 | $ 313.1 |  |
FGL [Member] | Anbang Insurance Group Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  |  |  |  |  |  |  |  |  |  |  | $ 26.80

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