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Investments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]          
Document Fiscal Year Focus     2016    
Long-term Debt $ 6,059.9   $ 6,059.9   $ 6,439.1
Asset-backed loans $ 48.2   $ 48.2   226.7
Industry Holdings, Number of Top Investments 10   10    
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments 10.00%   10.00%    
Total investments, Carrying Value $ 50.7   $ 50.7   $ 278.9
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) 16.9 $ (9.4) 17.0 $ (26.6)  
Provision for Loan, Lease, and Other Losses $ (11.7) 9.4 $ 2.7 77.7  
Fair Value, Concentration of Risk, All Financial Instruments [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio 24.30%   24.30%   16.50%
Asset based loan receivables [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Trading Securities $ 48.2   $ 48.2   $ 226.7
Estimate of Fair Value Measurement [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Asset-backed loans [1] 48.2   48.2   226.7
Estimate of Fair Value Measurement [Member] | Asset based loan receivables [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Trading Securities 48.2   48.2   226.7
Radioshack [Member] | Salus Capital Partners L L C [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt 250.0   250.0    
Radioshack [Member] | Front Street RE (Cayman) Ltd. [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt         7.0
Doubtful [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Asset Backed Loans And Other Invested Assets Gross 68.4   68.4   79.8
Radioshack [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Allowance for Loan and Lease Loss, Recovery of Bad Debts     18.0    
Long-term Debt         250.0
Financing Receivable, Allowance for Credit Losses, Write-downs (5.2) 0.0 (19.7) (51.1)  
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)       (19.2)  
Financing Receivable, Allowance for Credit Losses, Recovery 2.9 $ 0.0 2.9 $ 0.0  
Proceeds from Recoveries of Loans Previously Charged off     43.4    
Radioshack [Member] | Salus Capital Partners L L C [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt         93.0
Radioshack [Member] | FGL [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Proceeds from Recoveries of Loans Previously Charged off     21.7    
Radioshack [Member] | Asset based loan receivables [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Trading Securities 5.0   5.0    
Radioshack [Member] | Asset based loan receivables [Member] | FGL [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Trading Securities $ 2.5   2.5    
Radioshack [Member] | Loan Participations and Assignments [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Allowance for Loan and Lease Loss, Recovery of Bad Debts     $ 9.0    
Long-term Debt         50.0
Radioshack [Member] | Non-Qualifying Participation [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt         $ 100.0
[1] The carrying amounts of cash and cash equivalents, trade receivables, accounts payable and accrued investment income approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.