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Divestitures Divestitures - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Dec. 01, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
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, Valuation Allowance |  |  | 247.7 |  |
Discontinued Operation, Tax Effect of Discontinued Operation, Deferred Taxes, Current | [1] |  | 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 |  |
Compass Production Partners [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Transaction costs, Sale of Oil and Gas Properties |  | $ 1.9 |  |  |
Proceeds from Sale of Oil and Gas Property and Equipment |  | 147.5 | 4.2 |  |
Gain (Loss) on Disposition of Oil and Gas Property |  | $ 105.6 |  |  |
Majority-Owned Subsidiary, Unconsolidated [Member] | FGL [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Interest Income |  |  | 1.1 | $ 1.7 |
Impaired Financing Receivable, Related Allowance |  |  | $ 40.7 |  | $ 37.4
[1] | (b) Included in the income tax expense for the three months ended December 31, 2015 was a $90.9 net income tax expense related to the establishment of a deferred tax liability of $338.6 as a result of classifying our investment in FGL as held for sale, partially offset by a $247.7 reduction of valuation allowance on HRG’s net operating and capital loss carryforwards expected to offset the FGL taxable gain.

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