Divestitures Schedule of intercompany assets and liabilities of disposal group (Details) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015
Related Party Transaction [Line Items]
Funds Withheld Receivable	$ 1,664.0	$ 1,710.1
Other assets	143.6	134.3
Disposal Group, Including Discontinued Operation, Assets, Current	25,097.5	24,984.5
Assets	35,032.8	35,034.0
Insurance reserves	1,827.1	1,856.0
Debt	6,285.4	6,310.5	[1],[2]
Accounts payable and other current liabilities	854.1	1,095.6
Other liabilities	72.7	95.5
Disposal Group, Including Discontinued Operation, Liabilities, Current	23,630.8	23,420.9
Liabilities	33,659.8	33,445.9
FGL [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]
Related Party Transaction [Line Items]
Funds Withheld Receivable	1,007.1	1,058.0
Other assets	15.9	15.9
Disposal Group, Including Discontinued Operation, Assets, Current	1,694.7	1,769.8
Assets	2,717.7	2,843.7
Insurance reserves	1,198.0	1,226.8
Debt	249.0	330.7	[1],[2]
Accounts payable and other current liabilities		1.6
Other liabilities	12.4	11.0
Disposal Group, Including Discontinued Operation, Liabilities, Current	1,258.3	1,273.6
Liabilities	$ 2,717.7	$ 2,843.7

[1] The carrying amounts of cash and cash equivalents, trade receivables, accounts payable and accrued investment income approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.

[2] The fair values of debt set forth above are generally based on quoted or observed market prices.