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Divestitures - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax $ 445.9 $ 0.0  
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 500.8 302.8  
Net income $ 578.9 260.8  
Document Period End Date Dec. 31, 2017    
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down $ (445.9) $ 0.0  
Front Street RE (Cayman) Ltd. [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell     $ (19.0)
Selling Expense 65.0    
FGL [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell     402.2
Selling Expense 1,488.3    
GBA [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Selling Expense 2,000.0    
GBA [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net 100.0    
HGI      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Deferred Tax Assets, Valuation Allowance 430.8   $ 703.2
FS Holdco II Ltd. [Domain]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net $ 26.6    
FGL [Member] | CF Corporation [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Business Acquisition, Share Price $ 31.10