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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value Assets, level 1 to level 2 transfers $ 0 $ 0 $ 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 523,500,000 206,000,000 546,500,000
Total Gains (Losses) Included in Earnings 1,700,000 (100,000) 40,900,000
Total Gains (Losses) Included in AOCI 22,200,000 (14,000,000) 3,800,000
Purchases 570,500,000 428,200,000 427,200,000
Sales (12,100,000) (20,300,000) (27,300,000)
Settlements (15,900,000) (23,300,000) (53,300,000)
Net transfer In (Out) of Level 3 (a) (23,900,000) (53,000,000) (731,800,000) [1]
Balance at End of Period 1,066,000,000 523,500,000 206,000,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 1,875,200,000 1,782,800,000 1,472,100,000
Total Gains (Losses) Included in Earnings 383,400,000 95,200,000 310,700,000
Total Gains (Losses) Included in AOCI        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 150,600,000     
Sales        
Settlements (349,800,000) (2,800,000)  
Net transfer In (Out) of Level 3    [2]     
Balance at End of Period 2,059,400,000 1,875,200,000 1,782,800,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 30,900,000 [3]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements)     0
FIA embedded derivatives, included in contractholder funds
      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 1,544,400,000 1,550,800,000 1,396,300,000
Total Gains (Losses) Included in Earnings 363,700,000 (6,400,000) 154,500,000
Total Gains (Losses) Included in AOCI        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases        
Sales        
Settlements        
Net transfer In (Out) of Level 3        
Balance at End of Period 1,908,100,000 1,544,400,000 1,550,800,000
Front Street Future Policyholder Benefits Reserve [Member]
      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period       
Total Gains (Losses) Included in Earnings 7,000,000    
Total Gains (Losses) Included in AOCI       
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 150,600,000    
Sales       
Settlements (6,300,000)    
Net transfer In (Out) of Level 3       
Balance at End of Period 151,300,000    
Equity conversion feature of preferred stock
      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 330,800,000 232,000,000 75,400,000
Total Gains (Losses) Included in Earnings 12,700,000 101,600,000 156,600,000
Total Gains (Losses) Included in AOCI        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases        
Sales        
Settlements (343,500,000) (2,800,000)  
Net transfer In (Out) of Level 3        
Balance at End of Period    330,800,000 232,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements)     0
Available-for-sale embedded derivatives
      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period     400,000
Total Gains (Losses) Included in Earnings     (400,000)
Balance at End of Period     0
Asset-backed securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 5,000,000 15,900,000 374,500,000
Total Gains (Losses) Included in Earnings 0     
Total Gains (Losses) Included in AOCI (300,000) (200,000) 7,400,000
Purchases 36,100,000    410,700,000
Sales        
Settlements 0 (200,000) (38,800,000)
Net transfer In (Out) of Level 3 (a) (3,800,000) (10,500,000) (737,900,000) [1]
Balance at End of Period 37,000,000 5,000,000 15,900,000
Commercial mortgage-backed securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 5,700,000 5,000,000   
Total Gains (Losses) Included in Earnings         
Total Gains (Losses) Included in AOCI    (300,000)   
Purchases 83,700,000 1,000,000 5,000,000
Sales (300,000)      
Settlements 0      
Net transfer In (Out) of Level 3 (a) (6,000,000)      
Balance at End of Period 83,100,000 5,700,000 5,000,000
Corporates
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 461,100,000 135,300,000 159,700,000
Total Gains (Losses) Included in Earnings 0 (300,000) 0
Total Gains (Losses) Included in AOCI 19,100,000 (13,400,000) (3,600,000)
Purchases 398,100,000 406,000,000 1,300,000
Sales (11,800,000) (9,600,000) (26,800,000)
Settlements (2,400,000) (23,100,000) (14,200,000)
Net transfer In (Out) of Level 3 (a) (14,100,000) (33,800,000) 18,900,000 [1]
Balance at End of Period 850,000,000 461,100,000 135,300,000
Hybrids
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period   8,800,000 5,200,000
Total Gains (Losses) Included in Earnings       
Total Gains (Losses) Included in AOCI   (100,000) (100,000)
Purchases       
Sales       
Settlements       
Net transfer In (Out) of Level 3 (a)   (8,700,000) 3,700,000 [1]
Balance at End of Period      8,800,000
Municipal Debt Securities [Member]
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period      0
Total Gains (Losses) Included in Earnings 0   0
Total Gains (Losses) Included in AOCI 2,200,000   100,000
Purchases 35,000,000   10,200,000
Sales 0   0
Settlements 0   0
Net transfer In (Out) of Level 3 (a)      (10,300,000) [1]
Balance at End of Period 37,200,000   0
Non-agency residential mortgage-backed securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period     3,800,000
Total Gains (Losses) Included in Earnings     (100,000)
Total Gains (Losses) Included in AOCI     0
Sales     (500,000)
Settlements     (300,000)
Net transfer In (Out) of Level 3 (a)     (2,900,000) [1]
Balance at End of Period     0
Equity Securities Classified As Held For Trading
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 10,700,000     
Total Gains (Losses) Included in Earnings 1,300,000     
Total Gains (Losses) Included in AOCI        
Purchases 1,500,000 10,700,000  
Sales 0     
Settlements (13,500,000)     
Net transfer In (Out) of Level 3 (a) 0     
Balance at End of Period 0 10,700,000  
Equity Securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 0     
Total Gains (Losses) Included in Earnings 0 200,000  
Total Gains (Losses) Included in AOCI 1,200,000     
Purchases 4,800,000 10,500,000  
Sales 0 (10,700,000)  
Settlements 0     
Net transfer In (Out) of Level 3 (a) 0     
Balance at End of Period 6,000,000 0  
Other invested assets
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 0    
Total Gains (Losses) Included in Earnings (100,000)    
Total Gains (Losses) Included in AOCI 0    
Purchases 11,300,000    
Sales 0    
Settlements 0    
Net transfer In (Out) of Level 3 (a) 0    
Balance at End of Period 11,200,000    
Residential Mortgage Backed Securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period     3,300,000
Total Gains (Losses) Included in AOCI     0
Net transfer In (Out) of Level 3 (a)     (3,300,000) [1]
Balance at End of Period     0
Contingent purchase price reduction receivable
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at Beginning of Period 41,000,000 41,000,000   
Total Gains (Losses) Included in Earnings 500,000    41,000,000
Total Gains (Losses) Included in AOCI         
Purchases         
Sales         
Settlements         
Net transfer In (Out) of Level 3 (a)         
Balance at End of Period $ 41,500,000 $ 41,000,000 $ 41,000,000
[1] (a)The net transfers in and out of Level 3 during Fiscal 2012 was exclusively to or from Level 2.
[2] The net transfers in and out of Level 3 during Fiscal 2014 were exclusively to or from Level 2.
[3] (a)The net transfers in and out of Level 3 during Fiscal 2013 was exclusively to or from Level 2.