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Divestitures Divestitures - Additional Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
May 06, 2017
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Document Period End Date Jun. 30, 2017      
FGL [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Deferred Tax Assets, Valuation Allowance   $ 162.1    
Discontinued Operation, Tax Effect of Discontinued Operation, Deferred Taxes, Current   90.9    
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation   253.0    
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell $ 304.8     $ (362.8)
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax $ (58.0)      
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax   $ 15.0    
FGL [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percentage Of Ownership Interest 80.40%   50.00%