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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Commitment And Contingencies [Line Items]    
Reserves for legal, environmental and regulatory matters $ 8.7  
Long-term Debt 6,059.9 $ 6,439.1
Commitments and contingencies 114.7  
Expiration of partial amount of unfunded, legally binding lending commitments 20.8  
Loss Contingency Accrual, Provision $ 9.2  
Maximum [Member]    
Commitment And Contingencies [Line Items]    
Expiry date of partial amount of notional amount 1 year  
Expiry date of remainder part of notional amount 5 years  
Minimum [Member]    
Commitment And Contingencies [Line Items]    
Expiry date of remainder part of notional amount 1 year  
Fidelity And Guaranty Life Holdings [Member]    
Commitment And Contingencies [Line Items]    
Accrued amount of guaranty fund assessments $ 3.0  
Estimated future premium tax deductions 2.9  
Spectrum Brands [Member]    
Commitment And Contingencies [Line Items]    
Environmental costs recognized, capitalized 4.3  
FGL [Member]    
Commitment And Contingencies [Line Items]    
Reserves for legal, environmental and regulatory matters 4.4  
Salus Capital Partners L L C [Member]    
Commitment And Contingencies [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 8.6 $ 10.7
Haverhill Retirement vs HRG [Member]    
Commitment And Contingencies [Line Items]    
Litigation Settlement, Expense 0.2  
Cressy Plaintiff [Member]    
Commitment And Contingencies [Line Items]    
Loss Contingency Accrual, Provision 1.3  
Estimated Litigation Liability 0.6  
Eddie L. Cressy v. Fidelity Guaranty [sic] Life Insurance Company, et. al. [Member]    
Commitment And Contingencies [Line Items]    
Legal Fees 5.0  
Litigation Settlement, Expense 3.3  
Dale R. Ludwick, on behalf of Herself and All Others Similarly Situated v. Harbinger Group Inc., Fidelity & Guaranty Life Insurance Company, Raven Reinsurance Company, and Front Street Re (Cayman) Ltd [Member]    
Commitment And Contingencies [Line Items]    
Estimated Litigation Liability 1.5  
Radioshack [Member] | Salus Capital Partners L L C [Member]    
Commitment And Contingencies [Line Items]    
Long-term Debt 250.0  
Revolving Loan Facility 585.0  
Proposed Settlement [Member] | Kahn v. Philip A. Falcone et al [Member]    
Commitment And Contingencies [Line Items]    
Litigation Settlement, Amount 3.8  
Asset based loan receivables [Member]    
Commitment And Contingencies [Line Items]    
Commitments and contingencies $ 25.4