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Investments - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Insurers
Investment
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Insurers
Investment
Jun. 30, 2014
USD ($)
Sep. 30, 2014
USD ($)
Investment
Schedule of Available-for-sale Securities [Line Items]          
Document Period End Date     Jun. 30, 2015    
Asset Backed Loans And Other Invested Assets Gross $ 534.4   $ 534.4   $ 818.8
Long-term Debt 6,860.3   6,860.3   5,194.5
Asset-backed loans $ 490.0   $ 490.0   811.6
Industry holdings, number of top investments 10   10    
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments 40.30%   40.30%    
Total investments, Carrying Value $ 19,497.9   $ 19,497.9   19,252.5
Loans Receivable, Gross, Commercial, Mortgage $ 403.9   $ 403.9   $ 136.2
Commercial Mortgage Receivable, Percentage of Total 100.00%   100.00%   100.00%
Financing Receivable, Recorded Investment, Past Due $ 403.9   $ 403.9   $ 136.2
Financing Receivable, Allowance for Credit Losses, Write-downs     76.6    
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)     (37.2)    
Provision for Loan, Lease, and Other Losses 10.6 $ (0.3) 113.8 $ 1.5  
Non Agency Residential Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities 0.9   0.9    
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities (1.9)   (1.9)    
Other Marketable Securities, Current 15,964.0   15,964.0   15,009.3
Fidelity And Guaranty Life Holdings [Member] | Stockholders' Equity, Total [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value of investment $ 1,513.5   $ 1,513.5   $ 768.5
Percentage of fair value of the invested assets portfolio 7.80%   7.80%   4.00%
Investment in issuers | Investment 14   14   4
Investment Income [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Losses $ (6.2) (1.7) $ (50.7) (4.2)  
Available for sale securities on fixed maturity 1,863.9 1,724.6 3,669.7 4,352.5  
Available-for-sale Securities, Gross Realized Gains 59.8 $ 74.6 79.6 $ 96.8  
Concentration [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value $ 1,982.0   $ 1,982.0   $ 2,240.3
Percentage of fair value of the invested assets portfolio 10.20%   10.20%   11.60%
Number Of Issuers In Investment | Insurers 78   78    
Concentration [Member] | Fidelity And Guaranty Life Holdings [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value of investment $ 175.1   $ 175.1   $ 250.0
Percentage of fair value of the invested assets portfolio 0.90%   0.90%   1.30%
Insurance Segment [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value on securities $ 66.7   $ 66.7   $ 0.2
Percentage of amortized cost     20.00%    
Percentage of carrying values of all investments (less than 1%)     1.00%    
FHLB of Atlanta Funding Agreement Collateral Held [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment Owned, at Fair Value 540.0   $ 540.0   573.2
Fixed Maturities Available For Sale [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Total investments, Carrying Value 17,723.6   17,723.6   17,211.5
Fixed Maturities Available For Sale [Member] | Asset-backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Total investments, Carrying Value $ 1,887.5   $ 1,887.5   $ 1,792.9
Commercial Mortgage Loan [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans and Leases Receivable, Ratio of Performing Loans to All Loans 75.00%   75.00%    
Loan to Value, Maximum Threshold 100.00%   100.00%    
Investments, Cost or Amortized, Percentage of Total 0.00%   0.00%   0.00%
Industrial Property [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 9.2   $ 9.2   $ 0.0
Commercial Mortgage Receivable, Percentage of Total 2.20%   2.20%   0.00%
Warehouse [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 66.9   $ 66.9   $ 48.0
Commercial Mortgage Receivable, Percentage of Total 16.60%   16.60%   35.20%
Office Building [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 128.9   $ 128.9   $ 44.6
Commercial Mortgage Receivable, Percentage of Total 31.90%   31.90%   32.70%
Retail Site [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 128.9   $ 128.9   $ 5.8
Commercial Mortgage Receivable, Percentage of Total 31.90%   31.90%   4.30%
East North Central US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 113.3   $ 113.3   $ 27.8
Commercial Mortgage Receivable, Percentage of Total 28.10%   28.10%   20.40%
Middle Atlantic US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 81.3   $ 81.3   $ 10.9
Commercial Mortgage Receivable, Percentage of Total 20.10%   20.10%   8.00%
Pacific US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 81.2   $ 81.2   $ 61.5
Commercial Mortgage Receivable, Percentage of Total 20.10%   20.10%   45.10%
South Atlantic US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 55.7   $ 55.7   $ 0.0
Commercial Mortgage Receivable, Percentage of Total 13.80%   13.80%   0.00%
West North Central US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 5.6   $ 5.6   $ 5.8
Commercial Mortgage Receivable, Percentage of Total 1.40%   1.40%   4.30%
West South Central US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 19.6   $ 19.6   $ 30.2
Commercial Mortgage Receivable, Percentage of Total 4.90%   4.90%   22.20%
Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 383.6   $ 383.6   $ 135.4
Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 19.6   19.6   0.0
Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage [1] 0.7   0.7   0.8
LTV Less Than 50 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 93.9   $ 93.9   $ 45.4
Commercial Mortgage Receivable, Percentage of Total 23.30%   23.30%   33.30%
LTV Less Than 50 Percent [Member] | Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 93.2   $ 93.2   $ 44.6
LTV Less Than 50 Percent [Member] | Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0.0   0.0   0.0
LTV Less Than 50 Percent [Member] | Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage [1] 0.7   0.7   0.8
LTV 50 to 60 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 148.0   $ 148.0   $ 19.9
Commercial Mortgage Receivable, Percentage of Total 36.60%   36.60%   14.60%
LTV 50 to 60 Percent [Member] | Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 128.4   $ 128.4   $ 19.9
LTV 50 to 60 Percent [Member] | Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 19.6   19.6   0.0
LTV 50 to 60 Percent [Member] | Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage [1] 0.0   0.0   0.0
LTV 60 to 75 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 162.0   $ 162.0   $ 70.9
Commercial Mortgage Receivable, Percentage of Total 40.10%   40.10%   52.10%
LTV 60 to 75 Percent [Member] | Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 162.0   $ 162.0   $ 70.9
LTV 60 to 75 Percent [Member] | Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0.0   0.0   0.0
LTV 60 to 75 Percent [Member] | Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage [1] 0.0   0.0   0.0
Estimate of Fair Value Measurement [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Asset-backed loans [2] 490.0   490.0   151.7
Loans Receivable, Gross, Commercial, Mortgage $ 403.9   $ 403.9   $ 136.2
Commercial Mortgage Receivable, Percentage of Total 100.00%   100.00%   100.00%
Estimate of Fair Value Measurement [Member] | LTV Less Than 50 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 93.9   $ 93.9   $ 45.4
Commercial Mortgage Receivable, Percentage of Total 23.30%   23.30%   33.30%
Estimate of Fair Value Measurement [Member] | LTV 50 to 60 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 148.0   $ 148.0   $ 19.9
Commercial Mortgage Receivable, Percentage of Total 36.60%   36.60%   14.60%
Estimate of Fair Value Measurement [Member] | LTV 60 to 75 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage $ 162.0   $ 162.0   $ 70.9
Commercial Mortgage Receivable, Percentage of Total 40.10%   40.10%   52.10%
Financing Receivables, 1 to 29 Days Past Due [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Financing Receivable, Recorded Investment, Past Due $ 403.9   $ 403.9    
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] | Insurance And Financial Services [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt 150.0   150.0    
Non-Qualifying Participation [Member] | Radioshack [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt 100.0   100.0    
Countrywide Mortgage Finance Settlement [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Litigation Settlement, Amount 18.6        
Countrywide Mortgage Finance Settlement [Member] | Minimum [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Litigation Settlement, Amount 15.0        
Countrywide Mortgage Finance Settlement [Member] | Maximum [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Litigation Settlement, Amount 20.0        
Doubtful [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Asset Backed Loans And Other Invested Assets Gross $ 91.3   $ 91.3    
[1] (a) N/A - Current financial information not available.
[2] (a)The carrying amounts of trade receivables, accounts payable, accrued investment income and portions of other insurance liabilities approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.