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Investments - Available-for-Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 30, 2012
Sep. 30, 2012
Total investments, Cost or Amortized Cost $ 16,242.2 $ 15,846.3
Total investment, Gross Unrealized Gains 1,069.4 1,156.1
Equity Securities, Gross Unrealized Losses (21.4) (30.6)
Total investment, Gross Unrealized Losses (95.1) (84.0)
Total investment, Estimated Fair Value 17,216.5 16,918.4
Total investments, Carrying Value 17,216.5 16,918.4
Derivative investments, Cost or Amortized Cost 141.4 142.1
Derivative investments, Gross Unrealized Gains 35.3 67.0
Derivative investments, Gross Unrealized Losses (20.3) (8.4)
Derivative investments, Estimated Fair Value 156.4 200.7
Derivative investments, Carrying Value 156.4 200.7
Asset-backed loans, Cost or Amortized Cost 204.8 180.1
Asset-backed loans, Gross Unrealized Gains      
Asset-backed loans, Gross Unrealized Losses      
Asset-backed loans, Estimated Fair Value 204.8 180.1
Asset-backed loans, Carrying Value 204.8 180.1
Equity securities [Member]
    
Equity Securities, Cost or Amortized Cost 355.5 429.3
Equity Securities, Gross Unrealized Gains 11.7 11.9
Equity Securities, Gross Unrealized Losses (55.1) (46.3)
Equity Securities, Estimated Fair Value 312.1 394.9
Total investments, Carrying Value 312.1 394.9
Equity securities [Member] | Available-for-sale [Member]
    
Equity Securities, Cost or Amortized Cost 253.8 237.5
Equity Securities, Gross Unrealized Gains 11.7 11.9
Equity Securities, Gross Unrealized Losses (1.7) (1.3)
Equity Securities, Estimated Fair Value 263.8 248.1
Total investments, Carrying Value 263.8 248.1
Equity securities [Member] | Held for trading [Member]
    
Equity Securities, Cost or Amortized Cost 101.7 191.8
Equity Securities, Gross Unrealized Gains      
Equity Securities, Gross Unrealized Losses (53.4) (45.0)
Equity Securities, Estimated Fair Value 48.3 146.8
Total investments, Carrying Value 48.3 146.8
Other invested assets [Member]
    
Equity Securities, Cost or Amortized Cost 66.6 53.8
Equity Securities, Gross Unrealized Gains      
Equity Securities, Gross Unrealized Losses      
Equity Securities, Estimated Fair Value 66.6 53.8
Total investments, Carrying Value 66.6 53.8
Other invested assets [Member] | U.S. Treasuries and certificate of deposit, held-to-maturity [Member]
    
Equity Securities, Cost or Amortized Cost 33.9 35.0
Equity Securities, Gross Unrealized Gains      
Equity Securities, Gross Unrealized Losses      
Equity Securities, Estimated Fair Value 33.9 35.0
Total investments, Carrying Value 33.9 35.0
Other invested assets [Member] | Policy loans and other invested assets [Member]
    
Equity Securities, Cost or Amortized Cost 32.7 18.8
Equity Securities, Gross Unrealized Gains      
Equity Securities, Gross Unrealized Losses      
Equity Securities, Estimated Fair Value 32.7 18.8
Total investments, Carrying Value 32.7 18.8
Fixed-maturity securities, available-for-sale [Member]
    
Equity Securities, Cost or Amortized Cost 15,473.9 15,041.0
Equity Securities, Gross Unrealized Gains 1,022.4 1,077.2
Equity Securities, Gross Unrealized Losses (19.7) (29.3)
Equity Securities, Estimated Fair Value 16,476.6 16,088.9
Total investments, Carrying Value 16,476.6 16,088.9
Fixed-maturity securities, available-for-sale [Member] | Asset-backed securities [Member]
    
Equity Securities, Cost or Amortized Cost 1,263.6 1,010.9
Equity Securities, Gross Unrealized Gains 27.8 18.6
Equity Securities, Gross Unrealized Losses (0.7) (1.6)
Equity Securities, Estimated Fair Value 1,290.7 1,027.9
Total investments, Carrying Value 1,290.7 1,027.9
Fixed-maturity securities, available-for-sale [Member] | Commercial mortgage-backed securities [Member]
    
Equity Securities, Cost or Amortized Cost 526.4 520.0
Equity Securities, Gross Unrealized Gains 39.0 36.2
Equity Securities, Gross Unrealized Losses (1.8) (2.4)
Equity Securities, Estimated Fair Value 563.6 553.8
Total investments, Carrying Value 563.6 553.8
Fixed-maturity securities, available-for-sale [Member] | Corporates [Member]
    
Equity Securities, Cost or Amortized Cost 9,161.3 10,211.8
Equity Securities, Gross Unrealized Gains 724.1 807.2
Equity Securities, Gross Unrealized Losses (11.2) (10.0)
Equity Securities, Estimated Fair Value 9,874.2 11,009.0
Total investments, Carrying Value 9,874.2 11,009.0
Fixed-maturity securities, available-for-sale [Member] | Hybrids [Member]
    
Equity Securities, Cost or Amortized Cost 422.1 519.0
Equity Securities, Gross Unrealized Gains 21.1 18.8
Equity Securities, Gross Unrealized Losses (1.7) (9.6)
Equity Securities, Estimated Fair Value 441.5 528.2
Total investments, Carrying Value 441.5 528.2
Fixed-maturity securities, available-for-sale [Member] | Municipals [Member]
    
Equity Securities, Cost or Amortized Cost 1,039.3 1,083.2
Equity Securities, Gross Unrealized Gains 136.2 141.9
Equity Securities, Gross Unrealized Losses (1.2) (1.1)
Equity Securities, Estimated Fair Value 1,174.3 1,224.0
Total investments, Carrying Value 1,174.3 1,224.0
Fixed-maturity securities, available-for-sale [Member] | Agency residential mortgage-backed securities [Member]
    
Equity Securities, Cost or Amortized Cost 135.8 149.5
Equity Securities, Gross Unrealized Gains 4.5 5.8
Equity Securities, Gross Unrealized Losses (0.3) (0.3)
Equity Securities, Estimated Fair Value 140.0 155.0
Total investments, Carrying Value 140.0 155.0
Fixed-maturity securities, available-for-sale [Member] | Non-agency residential mortgage-backed securities [Member]
    
Equity Securities, Cost or Amortized Cost 914.1 629.1
Equity Securities, Gross Unrealized Gains 57.9 35.8
Equity Securities, Gross Unrealized Losses (2.8) (4.3)
Equity Securities, Estimated Fair Value 969.2 660.6
Total investments, Carrying Value 969.2 660.6
Fixed-maturity securities, available-for-sale [Member] | U.S. Government securities [Member]
    
Equity Securities, Cost or Amortized Cost 2,011.3 917.5
Equity Securities, Gross Unrealized Gains 11.8 12.9
Equity Securities, Gross Unrealized Losses     
Equity Securities, Estimated Fair Value 2,023.1 930.4
Total investments, Carrying Value $ 2,023.1 $ 930.4