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Related Party Transactions Addtional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
May 21, 2015
Sep. 30, 2014
Related Party Transaction [Line Items]          
Common stock repurchased     $ (22.2)    
Document Period End Date Sep. 30, 2017        
Long-term debt $ 5,801.9 $ 5,575.4      
Jefferies [Member]          
Related Party Transaction [Line Items]          
Investment Advisory, Management and Administrative Fees 3.0        
Fees and Commissions 1.0        
HCP Stockholders [Member]          
Related Party Transaction [Line Items]          
Expenses related to Services Agreement     3.3    
Parent Company [Member]          
Related Party Transaction [Line Items]          
Common stock repurchased 0.0 0.0 (22.1)    
Long-term debt 1,718.3 $ 1,711.2      
HC2 Holdings Inc. [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Sale of Stock, Number of Shares Issued in Transaction   1,200      
Sale of Stock, Consideration Received on Transaction   $ 35.1      
Proceeds from sale of equity securities, price per share   $ 7.50      
HC2 Holdings Inc. [Member] | Harbinger Capital Partners [Member]          
Related Party Transaction [Line Items]          
Sale of Stock, Number of Shares Issued in Transaction   540      
Front Street RE (Cayman) Ltd. [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Sale of Stock, Consideration Received on Transaction   $ 14.0      
Fixed Maturities Securities | Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Net Investment Income 11.6 11.0 9.5    
Related Party Transaction, Due from (to) Related Party, Noncurrent 176.3 227.5      
Severance Cost, one time payments [Member]          
Related Party Transaction [Line Items]          
Severance Costs $ 3.0   20.5    
Severance Cost, Accrued Bonus [Member]          
Related Party Transaction [Line Items]          
Severance Costs     16.5    
Severance Cost, Future Bonus [Member]          
Related Party Transaction [Line Items]          
Severance Costs     3.3    
Bridge Loan [Member] | Spectrum Brands [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Long-term debt       $ 1,500.0  
Five Point Seven Five Percentage Senior Notes [Member] | Spectrum Brands [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Payments for Commissions   2.6      
Seven Point Seven Five Percent Senior Unsecured Notes [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Payments for Commissions     0.3    
7.875% Senior Secured Notes, due July 15, 2019 | Jefferies [Member]          
Related Party Transaction [Line Items]          
Payments for Commissions     0.7    
Public offering of common stock [Member] | Spectrum Brands [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Payments for Commissions   1.5      
AAG Acquisition [Member] | Spectrum Brands [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Payments for Commissions     $ 2.1    
Four Point Zero Percent Senior Notes [Member] | Spectrum Brands [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Payments for Commissions   0.3      
Real Estate Investments [Member] | Spectrum Brands [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Asset Management Fees   $ 0.4      
Common Stock          
Related Party Transaction [Line Items]          
Common stock, shares, issued 200,600 200,800 201,400   202,300
Common Stock | Spectrum Brands [Member]          
Related Party Transaction [Line Items]          
Proceeds from Issuance of Common Stock   $ 575.0      
Five Point Seven Five Percent Senior Notes Due July 15 2025 [Member] | Spectrum Brands [Member]          
Related Party Transaction [Line Items]          
Long-term debt, interest rate 5.75% 5.80%      
Long-term debt $ 1,000.0 $ 1,000.0      
7.875% Senior Secured Notes, due July 15, 2019 | Secured Debt [Member] | Parent Company [Member]          
Related Party Transaction [Line Items]          
Long-term debt, interest rate 7.875% 7.90%      
Four Point Zero Percent Senior Notes [Member] | Spectrum Brands [Member]          
Related Party Transaction [Line Items]          
Long-term debt   $ 425.0      
Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member] | Spectrum Brands [Member]          
Related Party Transaction [Line Items]          
Long-term debt, interest rate 4.00% 4.00%      
Seven Point Seven Five Percent Senior Unsecured Notes [Member] | Parent Company [Member]          
Related Party Transaction [Line Items]          
Long-term debt, interest rate 7.75% 7.75%      
Long-term debt   $ 890.0      
FGL [Member]          
Related Party Transaction [Line Items]          
Disposal Group, Including Discontinued Operation, Revenue     $ 947.2    
Net Investment Income | FGL [Member]          
Related Party Transaction [Line Items]          
Disposal Group, Including Discontinued Operation, Revenue     $ 923.0