Funds Withheld Receivables Gain (Loss) on Investments (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Gain (Loss) on Sale of Equity Investments		$ 3.0	$ (4.9)	$ 14.6
Gain (Loss) on Sale of Derivatives		3.8	(7.6)	25.7
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	[1]	49.4	(91.1)	41.6
Gain (Loss) on Sale of Other Investments		49.7	(13.8)	9.9
Net investment gains (losses)		101.1	(114.0)	89.3
Fixed Maturity Available For Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain Loss On Sale Of Available For Sale Securities		$ (4.8)	$ 3.4	$ (2.5)

[1] (a) The modified coinsurance arrangement between FGL Insurance and Front Street created an obligation for the parties to settle a payable or receivable at a later date, which resulted in an embedded derivative. This embedded derivative is considered a total return swap with contractual returns that are attributable to the assets and liabilities associated with this reinsurance arrangement. The fair value of the total return swap is based on the change in fair value of the underlying assets held in the funds withheld portfolio. Investment results for the assets that support the coinsurance with funds withheld reinsurance arrangement, including gains and losses from sales, are passed directly to the reinsurer pursuant to contractual terms of the reinsurance arrangement. The reinsurance related embedded derivative is expected to continue to exist after the disposal of FGL and is therefore not eliminated to appropriately reflect the continuing operations and balances held for sale. It is embedded in the funds withheld receivables with a corresponding asset in business held for sale on the Consolidated Balance Sheets and the related gains or losses are reported in net investment gains with corresponding income (loss) from discontinued operations on the Consolidated Statements of Operations.