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Investments - Available-for-Sale Securities (Detail) (USD $)
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Schedule of Investments [Line Items]                
Document Period End Date     Jun. 30, 2014          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 930,600,000 $ 502,700,000 $ 930,600,000 $ 502,700,000 $ 755,600,000 $ 523,500,000 $ 419,000,000 $ 206,000,000
Total Gains (Losses) Included in Earnings 1,500,000    2,100,000 (300,000)        
Total investments, Carrying Value 18,751,100,000   18,751,100,000     16,465,900,000    
Available-for-sale Debt Securities, Amortized Cost Basis 15,914,300,000   15,914,300,000          
Total investments, Cost or Amortized Cost 17,744,600,000   17,744,600,000     16,190,100,000    
Investments, Unrealized Losses (100,300,000)   (100,300,000)     (311,500,000)    
Investments, Unrealized Gains 1,106,800,000   1,106,800,000     587,300,000    
Total investment, Estimated Fair Value 18,751,100,000   18,751,100,000     16,465,900,000    
Total Gains (Losses) Included in AOCI 15,900,000 (10,800,000) 20,500,000 (9,600,000)        
Purchases 191,000,000 106,300,000 425,300,000 394,700,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 1,000,000    1,000,000 9,600,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 13,500,000 11,800,000 15,900,000 25,500,000        
Net transfer In (Out) of Level 3 (a) (18,900,000) [1],[2]    [1] (23,900,000) [1],[2] (53,000,000) [1]        
Asset-backed securities [Member]
                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5,900,000 5,100,000 5,900,000 5,100,000 10,700,000 5,000,000 5,300,000 15,900,000
Total Gains (Losses) Included in Earnings 0    0           
Total Gains (Losses) Included in AOCI 0 (100,000) (300,000) (200,000)        
Purchases 0    5,000,000           
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 100,000 0 100,000        
Net transfer In (Out) of Level 3 (a) (4,800,000) [2]    [1] (3,800,000) [2] (10,500,000) [1]        
Commercial mortgage-backed securities [Member]
                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 83,900,000 5,900,000 83,900,000 5,900,000    5,700,000 6,200,000 5,000,000
Total Gains (Losses) Included in Earnings                    
Total Gains (Losses) Included in AOCI 100,000 (300,000) 400,000 (100,000)        
Purchases 83,800,000    83,800,000 1,000,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0    0           
Net transfer In (Out) of Level 3 (a)    [2]    [1] (6,000,000) [2]    [1]        
Corporates [Member]
                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 745,200,000 439,000,000 745,200,000 439,000,000 657,000,000 461,100,000 356,500,000 135,300,000
Total Gains (Losses) Included in Earnings 0    0 (300,000)        
Total Gains (Losses) Included in AOCI 14,400,000 (12,000,000) 18,400,000 (10,800,000)        
Purchases 88,900,000 106,200,000 283,200,000 383,600,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 1,000,000    1,000,000 9,600,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 11,700,000 2,400,000 25,400,000        
Net transfer In (Out) of Level 3 (a) (14,100,000) [2]    [1] (14,100,000) [2] (33,800,000) [1]        
Hybrids [Member]
                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value                 8,800,000
Total Gains (Losses) Included in Earnings                 
Total Gains (Losses) Included in AOCI       (100,000)        
Purchases                 
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales                 
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements                 
Net transfer In (Out) of Level 3 (a)       (8,700,000) [1]        
Municipals [Member]
                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 36,500,000   36,500,000   35,600,000       
Total Gains (Losses) Included in Earnings 0   0          
Total Gains (Losses) Included in AOCI 900,000   1,500,000          
Purchases 0   35,000,000          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0   0          
Net transfer In (Out) of Level 3 (a) 0      [2]          
Non-agency residential mortgage-backed securities [Member]
                
Schedule of Investments [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 900,000   900,000          
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities           (1,900,000)    
Other Marketable Securities, Current 14,795,600,000   14,795,600,000     19,400,000    
Equity Securities [Member]
                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 6,000,000 11,700,000 6,000,000 11,700,000 0 0 10,000,000 0
Total Gains (Losses) Included in Earnings 1,200,000 0 0 0        
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 29,600,000   29,600,000     7,300,000    
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (35,600,000)   (35,600,000)     (49,500,000)    
Available-for-sale Securities, Equity Securities 760,700,000   760,700,000     352,500,000    
Total investments, Carrying Value 760,700,000   760,700,000     352,500,000    
Available-for-sale Equity Securities, Amortized Cost Basis 766,700,000   766,700,000     394,700,000    
Total Gains (Losses) Included in AOCI 500,000 1,600,000 500,000 1,600,000        
Purchases 5,500,000 100,000 5,500,000 10,100,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0 0 0        
Net transfer In (Out) of Level 3 (a) 0 [2] 0 [2] 0 [2] 0 [2]        
Equity Securities [Member] | Available-for-sale [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 23,500,000   23,500,000     6,700,000    
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (4,900,000)   (4,900,000)     (10,300,000)    
Available-for-sale Securities, Equity Securities 663,400,000   663,400,000     271,000,000    
Total investments, Carrying Value 663,400,000   663,400,000     271,000,000    
Available-for-sale Equity Securities, Amortized Cost Basis 644,800,000   644,800,000     274,600,000    
Equity Securities [Member] | Held for trading [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 6,100,000   6,100,000     600,000    
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (30,700,000)   (30,700,000)     (39,200,000)    
Available-for-sale Securities, Equity Securities 97,300,000   97,300,000     81,500,000    
Total investments, Carrying Value 97,300,000   97,300,000     81,500,000    
Available-for-sale Equity Securities, Amortized Cost Basis 121,900,000   121,900,000     120,100,000    
Fixed-maturity securities, available-for-sale [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 916,500,000   916,500,000     491,500,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (63,700,000)   (63,700,000)     (253,600,000)    
Available-for-sale Securities, Debt Securities 16,767,100,000   16,767,100,000     15,300,000,000    
Total investments, Carrying Value 16,767,100,000   16,767,100,000     15,300,000,000    
Available-for-sale Debt Securities, Amortized Cost Basis 15,914,300,000   15,914,300,000     15,062,100,000    
Fixed-maturity securities, available-for-sale [Member] | Asset-backed securities [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 16,100,000   16,100,000     22,600,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (9,500,000)   (9,500,000)     (5,200,000)    
Available-for-sale Securities, Debt Securities 1,737,700,000   1,737,700,000     1,523,100,000    
Total investments, Carrying Value 1,737,700,000   1,737,700,000     1,523,100,000    
Available-for-sale Debt Securities, Amortized Cost Basis 1,731,100,000   1,731,100,000     1,505,700,000    
Fixed-maturity securities, available-for-sale [Member] | Commercial mortgage-backed securities [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 26,300,000   26,300,000     24,700,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1,100,000)   (1,100,000)     (1,600,000)    
Available-for-sale Securities, Debt Securities 610,200,000   610,200,000     454,400,000    
Total investments, Carrying Value 610,200,000   610,200,000     454,400,000    
Available-for-sale Debt Securities, Amortized Cost Basis 585,000,000   585,000,000     431,300,000    
Fixed-maturity securities, available-for-sale [Member] | Corporates [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 568,500,000   568,500,000     288,700,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (36,600,000)   (36,600,000)     (185,100,000)    
Available-for-sale Securities, Debt Securities 10,297,800,000   10,297,800,000     9,418,300,000    
Total investments, Carrying Value 10,297,800,000   10,297,800,000     9,418,300,000    
Available-for-sale Debt Securities, Amortized Cost Basis 9,765,900,000   9,765,900,000     9,314,700,000    
Fixed-maturity securities, available-for-sale [Member] | Hybrids [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 39,800,000   39,800,000     19,500,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (200,000)   (200,000)     (3,300,000)    
Available-for-sale Securities, Debt Securities 481,600,000   481,600,000     428,800,000    
Total investments, Carrying Value 481,600,000   481,600,000     428,800,000    
Available-for-sale Debt Securities, Amortized Cost Basis 442,000,000   442,000,000     412,600,000    
Fixed-maturity securities, available-for-sale [Member] | Municipals [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 111,900,000   111,900,000     49,000,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (7,200,000)   (7,200,000)     (40,800,000)    
Available-for-sale Securities, Debt Securities 1,255,700,000   1,255,700,000     1,007,000,000    
Total investments, Carrying Value 1,255,700,000   1,255,700,000     1,007,000,000    
Available-for-sale Debt Securities, Amortized Cost Basis 1,151,000,000   1,151,000,000     998,800,000    
Fixed-maturity securities, available-for-sale [Member] | Agency residential mortgage-backed securities [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 3,400,000   3,400,000     2,400,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax             (300,000)    
Available-for-sale Securities, Debt Securities 99,500,000   99,500,000     98,600,000    
Total investments, Carrying Value 99,500,000   99,500,000     98,600,000    
Available-for-sale Debt Securities, Amortized Cost Basis 96,100,000   96,100,000     96,500,000    
Fixed-maturity securities, available-for-sale [Member] | Non-agency residential mortgage-backed securities [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 143,300,000   143,300,000     77,400,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (7,800,000)   (7,800,000)     (13,400,000)    
Available-for-sale Securities, Debt Securities 1,874,100,000   1,874,100,000     1,368,000,000    
Total investments, Carrying Value 1,874,100,000   1,874,100,000     1,368,000,000    
Available-for-sale Debt Securities, Amortized Cost Basis 1,738,600,000   1,738,600,000     1,304,000,000    
Fixed-maturity securities, available-for-sale [Member] | U.S. Government securities [Member]
                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,200,000   7,200,000     7,200,000    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1,300,000)   (1,300,000)     (3,900,000)    
Available-for-sale Securities, Debt Securities 410,500,000   410,500,000     1,001,800,000    
Total investments, Carrying Value 410,500,000   410,500,000     1,001,800,000    
Available-for-sale Debt Securities, Amortized Cost Basis 404,600,000   404,600,000     998,500,000    
Derivative Financial Instruments, Assets [Member]
                
Schedule of Investments [Line Items]                
Trading Securities, Cost 165,100,000   165,100,000     141,700,000    
Trading Securities 324,700,000   324,700,000     221,800,000    
Asset-Backed Loans, Gross Unrealized Gain 160,600,000   160,600,000     88,500,000    
Other Short Term Investments Gross Unrealized Losses (1,000,000)   (1,000,000)     (8,400,000)    
Asset based loan receivables [Member]
                
Schedule of Investments [Line Items]                
Trading Securities, Cost 724,300,000   724,300,000     560,400,000    
Trading Securities 724,300,000   724,300,000     560,400,000    
Asset-Backed Loans, Gross Unrealized Gain                   
Other Short Term Investments Gross Unrealized Losses                   
Other Invested Assets [Member]
                
Schedule of Investments [Line Items]                
Trading Securities, Cost 174,200,000   174,200,000     31,200,000    
Trading Securities 174,300,000   174,300,000     31,200,000    
Asset-Backed Loans, Gross Unrealized Gain 100,000   100,000           
Other Short Term Investments Gross Unrealized Losses                   
[1] (a)The net transfers in and out of Level 3 during the nine months ended June 30, 2013 were exclusively to or from Level 2.
[2] This includes a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from level 3 to level 2.