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.