Divestitures Schedule of assets and liabilities held for sale (Details) - FGL [Member] - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Investment	$ 19,071.2	$ 19,206.7
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	567.9	501.8
Disposal Group, Including Discontinued Operation, Accrued Investment Income	180.9	191.2
Disposal Group, Including Discontinued Operation, Reinsurance Recoverable	3,551.6	3,578.7
Disposal Group, Including Discontinued Operation, Deferred Tax Assets	248.3	194.7
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	15.5	14.4
Disposal Group, Including Discontinued Operation, Intangible Assets	1,230.6	1,048.6
Disposal Group, Including Discontinued Operation, Other Assets	231.5	248.4
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Disposal Group, Including Discontinued Operation, Assets	25,097.5	24,984.5
Disposal Group, Including Discontinued Operation, Insurance Reserves	22,748.5	22,560.1
Disposal Group, Including Discontinued Operation, Debt	299.2	298.3
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	35.7	43.7
Disposal Group, Including Discontinued Operation, Other Liabilities	547.4	518.8
Disposal Group, Including Discontinued Operation, Liabilities	$ 23,630.8	$ 23,420.9