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Investments - Available-for-Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 15 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jul. 01, 2012
Jul. 01, 2013
Dec. 30, 2012
Sep. 30, 2012
Jul. 31, 2012
Jan. 01, 2012
Sep. 30, 2011
Schedule of Investments [Line Items]                  
Document Period End Date   Jun. 30, 2013              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 502.7 $ 502.7     $ 419.0 $ 206.0 $ 1,011.8 $ 684.1 $ 546.5
Total Gains (Losses) Included in Earnings    (0.3) 41.1 0.1          
Asset Backed Securities Fair Value Disclosure 430.2 430.2       180.1      
Total investments, Carrying Value 16,600.5 16,600.5       16,918.4      
Derivative investments, Cost or Amortized Cost 140.6 140.6       142.1      
Derivative investments, Gross Unrealized Gains 95.3 95.3       67.0      
Derivative investments, Gross Unrealized Losses 8.5 8.5       8.4      
Derivative investments, Estimated Fair Value 227.4 227.4       200.7      
Derivative investments, Carrying Value 227.4 227.4       200.7      
Asset-Backed Loans, Cost or Amortized Cost 430.2 430.2       180.1      
Asset-Backed Loans, Gross Unrealized Gain                     
Other Short Term Investments Gross Unrealized Losses                     
Asset-Backed Loans, at Carrying Value 430.2 430.2       180.1      
Total investments, Cost or Amortized Cost 16,159.1 16,159.1       15,846.3      
Investments, Unrealized Losses 712.0 712.0       (84.0)      
Investments, Unrealized Gains (270.6) (270.6)       1,156.1      
Total investment, Gross Unrealized Losses 217.5 217.5       30.6      
Total investment, Estimated Fair Value 16,600.5 16,600.5       16,918.4      
Total Gains (Losses) Included in AOCI (10.8) (9.6) 1.2 (2.5)          
Purchases 106.3 394.7 496.7 352.8          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales    9.6 24.9 8.2          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 11.8 25.5 77.4 44.8          
Net transfer In (Out) of Level 3 (a)    [1] (53.0) [1] 28.6 [2] 30.3 [2]          
Asset-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5.1 5.1     5.3 15.9 759.1 503.0 374.5
Total Gains (Losses) Included in Earnings                      
Total investment, Gross Unrealized Losses 4.6 4.6       1.6      
Total Gains (Losses) Included in AOCI (0.1) (0.2) 7.0 0.9          
Purchases    0 394.9 262.5          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.1 0.1 31.8 11.0          
Net transfer In (Out) of Level 3 (a)    [1] (10.5) [1] 14.5 [2] 3.7 [2]          
Commercial mortgage-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5.9 5.9     6.2 5.0      
Total Gains (Losses) Included in Earnings                    
Total investment, Gross Unrealized Losses 0.7 0.7       2.4      
Total Gains (Losses) Included in AOCI (0.3) (0.1)              
Purchases    1.0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements    0              
Net transfer In (Out) of Level 3 (a)    [1]    [1]              
Corporates [Member]
                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 439.0 439.0     356.5 135.3 205.8 120.1 159.7
Total Gains (Losses) Included in Earnings    (0.3) 0.2 0.2          
Total investment, Gross Unrealized Losses 163.5 163.5       10.0      
Total Gains (Losses) Included in AOCI (12.0) (10.8) (5.9) (3.6)          
Purchases 106.2 383.6 91.6 90.3          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales    9.6 24.4 7.7          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 11.7 25.4 45.3 33.7          
Net transfer In (Out) of Level 3 (a)    [1] (33.8) [1] 29.9 [2] 40.2 [2]          
Hybrids [Member]
                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value             8.8 5.2 5.1 5.2
Total Gains (Losses) Included in Earnings                     
Total investment, Gross Unrealized Losses (3.1) (3.1)       9.6      
Total Gains (Losses) Included in AOCI   (0.1)    0.1          
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)   (8.7) [1]    [2]    [2]          
Municipals [Member]
                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value             0.1 10.4   
Total Gains (Losses) Included in Earnings                    
Total investment, Gross Unrealized Losses 27.4 27.4       1.1      
Total Gains (Losses) Included in AOCI     0.1             
Purchases     10.2             
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)     (10.2) [2] (10.3) [2]          
Agency residential mortgage-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Total investment, Gross Unrealized Losses 0.4 0.4       0.3      
Non-agency residential mortgage-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value             0.6 1.2 3.8
Total Gains (Losses) Included in Earnings     (0.1) (0.1)          
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities 0 0       0.9      
Total investment, Gross Unrealized Losses 9.3 9.3       4.3      
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities 0 0       1.9      
Other Marketable Securities, Current 0 0       0      
Total Gains (Losses) Included in AOCI        0.1          
Purchases                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales     0.5 0.5          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements     0.3 0.1          
Net transfer In (Out) of Level 3 (a)     (2.3) [2]    [2]          
U.S. Government securities [Member]
                  
Schedule of Investments [Line Items]                  
Total investment, Gross Unrealized Losses 3.9 3.9              
Equity securities [Member]
                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 11.7 11.7     10.0 0      
Total Gains (Losses) Included in Earnings 0 0              
Equity Securities, Cost or Amortized Cost 375.4 375.4       429.3      
Equity Securities, Estimated Fair Value 337.0 337.0       394.9      
Total investments, Carrying Value 337.0 337.0       394.9      
Total investment, Gross Unrealized Gains 10.8 10.8       11.9      
Total investment, Gross Unrealized Losses 49.2 49.2       46.3      
Total Gains (Losses) Included in AOCI 1.6 1.6              
Purchases 0.1 10.1              
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 0              
Equity securities [Member] | Available-for-sale [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 265.2 265.2       237.5      
Equity Securities, Estimated Fair Value 269.8 269.8       248.1      
Total investments, Carrying Value 269.8 269.8       248.1      
Total investment, Gross Unrealized Gains 9.2 9.2       11.9      
Total investment, Gross Unrealized Losses 4.6 4.6       1.3      
Equity securities [Member] | Held for trading [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 110.2 110.2       191.8      
Equity Securities, Estimated Fair Value 67.2 67.2       146.8      
Total investments, Carrying Value 67.2 67.2       146.8      
Total investment, Gross Unrealized Gains 1.6 1.6               
Total investment, Gross Unrealized Losses 44.6 44.6       45.0      
Fixed-maturity securities, available-for-sale [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 15,185.3 15,185.3       15,041.0      
Equity Securities, Estimated Fair Value 15,578.3 15,578.3       16,088.9      
Total investments, Carrying Value 15,578.3 15,578.3       16,088.9      
Total investment, Gross Unrealized Gains 605.9 605.9       1,077.2      
Total investment, Gross Unrealized Losses 212.9 212.9       29.3      
Fixed-maturity securities, available-for-sale [Member] | Asset-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 1,416.2 1,416.2       1,010.9      
Equity Securities, Estimated Fair Value 1,437.5 1,437.5       1,027.9      
Total investments, Carrying Value 1,437.5 1,437.5       1,027.9      
Total investment, Gross Unrealized Gains 25.9 25.9       18.6      
Total investment, Gross Unrealized Losses 4.6 4.6       1.6      
Fixed-maturity securities, available-for-sale [Member] | Commercial mortgage-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 496.5 496.5       520.0      
Equity Securities, Estimated Fair Value 523.9 523.9       553.8      
Total investments, Carrying Value 523.9 523.9       553.8      
Total investment, Gross Unrealized Gains 28.1 28.1       36.2      
Total investment, Gross Unrealized Losses 0.7 0.7       2.4      
Fixed-maturity securities, available-for-sale [Member] | Corporates [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 10,008.8 10,008.8       10,211.8      
Equity Securities, Estimated Fair Value 10,212.8 10,212.8       11,009.0      
Total investments, Carrying Value 10,212.8 10,212.8       11,009.0      
Total investment, Gross Unrealized Gains 367.5 367.5       807.2      
Total investment, Gross Unrealized Losses 163.5 163.5       10.0      
Fixed-maturity securities, available-for-sale [Member] | Hybrids [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 483.6 483.6       519.0      
Equity Securities, Estimated Fair Value 508.3 508.3       528.2      
Total investments, Carrying Value 508.3 508.3       528.2      
Total investment, Gross Unrealized Gains 27.8 27.8       18.8      
Total investment, Gross Unrealized Losses 3.1 3.1       9.6      
Fixed-maturity securities, available-for-sale [Member] | Municipals [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 1,005.2 1,005.2       1,083.2      
Equity Securities, Estimated Fair Value 1,036.9 1,036.9       1,224.0      
Total investments, Carrying Value 1,036.9 1,036.9       1,224.0      
Total investment, Gross Unrealized Gains 59.1 59.1       141.9      
Total investment, Gross Unrealized Losses 27.4 27.4       1.1      
Fixed-maturity securities, available-for-sale [Member] | Agency residential mortgage-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 108.7 108.7       149.5      
Equity Securities, Estimated Fair Value 111.0 111.0       155.0      
Total investments, Carrying Value 111.0 111.0       155.0      
Total investment, Gross Unrealized Gains 2.7 2.7       5.8      
Total investment, Gross Unrealized Losses 0.4 0.4       0.3      
Fixed-maturity securities, available-for-sale [Member] | Non-agency residential mortgage-backed securities [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 1,274.8 1,274.8       629.1      
Equity Securities, Estimated Fair Value 1,353.9 1,353.9       660.6      
Total investments, Carrying Value 1,353.9 1,353.9       660.6      
Total investment, Gross Unrealized Gains 88.4 88.4       35.8      
Total investment, Gross Unrealized Losses 9.3 9.3       4.3      
Fixed-maturity securities, available-for-sale [Member] | U.S. Government securities [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 391.5 391.5       917.5      
Equity Securities, Estimated Fair Value 394.0 394.0       930.4      
Total investments, Carrying Value 394.0 394.0       930.4      
Total investment, Gross Unrealized Gains 6.4 6.4       12.9      
Total investment, Gross Unrealized Losses 3.9 3.9               
Other invested assets [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost           53.8      
Equity Securities, Estimated Fair Value           53.8      
Total investments, Carrying Value           53.8      
Total investment, Gross Unrealized Gains                   
Total investment, Gross Unrealized Losses                   
Other invested assets [Member] | U.S. Treasuries and certificate of deposit, held-to-maturity [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost           35.0      
Equity Securities, Estimated Fair Value           35.0      
Total investments, Carrying Value           35.0      
Total investment, Gross Unrealized Gains                   
Total investment, Gross Unrealized Losses                   
Other invested assets [Member] | Policy loans and other invested assets [Member]
                  
Schedule of Investments [Line Items]                  
Equity Securities, Cost or Amortized Cost 27.6 27.6       18.8      
Equity Securities, Estimated Fair Value 27.6 27.6       18.8      
Total investments, Carrying Value 27.6 27.6       18.8      
Total investment, Gross Unrealized Gains                   
Total investment, Gross Unrealized Losses $ 0 $ 0               
[1] The net transfers in and out of Level 3 during the three and nine months ended June 30, 2013 were exclusively to or from Level 2.
[2] The net transfers in and out of Level 3 during the three and nine months ended July 1, 2012 was exclusively to or from Level 2.