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Divestitures Divestitures - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Document Fiscal Year Focus     2017    
Document Period End Date     Mar. 31, 2017    
FGL [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Deferred Tax Assets, Valuation Allowance   $ 237.7   $ 237.7  
Discontinued Operation, Tax Effect of Discontinued Operation, Deferred Taxes, Current       90.9  
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation   328.6   328.6  
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell $ (291.1)   $ (291.1)   $ (362.8)
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax $ 72.8 23.5 $ (71.7) 23.5  
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax   $ 13.2   $ 13.2  
FGL [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Percentage Of Ownership Interest 80.40%   80.40%    
FGL [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Business Acquisition, Share Price $ 27.80   $ 27.80