Divestitures Divestitures - Schedule of intercompany assets and liabilities of disposal group (Details) - USD ($) $ in Millions	Mar. 31, 2016	Sep. 30, 2015
Related Party Transaction [Line Items]
Funds Withheld Receivable	$ 1,679.4	$ 1,710.1
Other assets	149.1	134.3
Disposal Group, Including Discontinued Operation, Assets, Current	25,544.0	24,984.5
Total assets	35,455.1	35,034.0
Insurance reserves	1,824.8	1,856.0
Debt	6,232.0	6,310.5	[1],[2]
Accounts payable and other current liabilities	847.5	1,095.6
Other liabilities	71.6	95.5
Disposal Group, Including Discontinued Operation, Liabilities, Current	23,988.1	23,420.9
Total liabilities	33,947.2	33,445.9
FGL [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]
Related Party Transaction [Line Items]
Funds Withheld Receivable	993.0	1,058.0
Other assets	15.6	15.9
Disposal Group, Including Discontinued Operation, Assets, Current	1,618.7	1,769.8
Total assets	2,627.3	2,843.7
Insurance reserves	1,170.8	1,226.8
Debt	217.5	330.7
Accounts payable and other current liabilities	1.1	1.6
Other liabilities	12.7	11.0
Disposal Group, Including Discontinued Operation, Liabilities, Current	1,225.2	1,273.6
Total liabilities	$ 2,627.3	$ 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.