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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Jan. 01, 2012
Sep. 30, 2011
Assets        
Cash and cash equivalents $ 1,475.0 $ 1,470.7 $ 2,319.7 $ 1,137.4
Derivatives, Assets        
Derivatives 262.6 200.7    
Fixed maturity securities, available-for-sale:        
Asset-backed loans 241.6 180.1    
Derivatives, Liabilities        
Equity conversion feature of preferred stock 202.7 232.0    
Recurring [Member] | Fair Value [Member]
       
Assets        
Cash and cash equivalents 1,475.0 [1],[2] 1,470.7 [1],[2]    
Contingent purchase price reduction receivable 41.0 [2] 41.0 [2]    
Fixed maturity securities, available-for-sale:        
Asset-backed loans 241.6 [2] 180.1 [2]    
Total financial assets 18,552.9 [2] 18,433.3 [2]    
Liabilities        
Total debt 4,881.4 [2] 2,328.8 [1],[2]    
Derivatives, Liabilities        
Equity conversion feature of preferred stock 202.7 [2] 232.0 [2]    
Redeemable preferred stock, excluding equity conversion feature 379.4 [2] 368.9 [2]    
Investment contracts, included in contractholder funds 12,288.1 [2] 12,271.9 [2]    
Total financial liabilities 19,405.1 [2] 16,763.3 [2]    
Recurring [Member] | Fair Value [Member] | U.S. Government securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 458.5 [2] 930.4 [2]    
Recurring [Member] | Fair Value [Member] | Foreign exchange forward agreements [Member]
       
Derivatives, Assets        
Derivatives 3.2 [2] 1.2 [2]    
Derivatives, Liabilities        
Derivative investments 4.8 [2] 10.0 [2]    
Recurring [Member] | Fair Value [Member] | Commodity swap and option agreements [Member]
       
Derivatives, Assets        
Derivatives 0.4 [2] 2.0 [2]    
Derivatives, Liabilities        
Derivative investments 9.1 [2]    [2]    
Recurring [Member] | Fair Value [Member] | Call options [Member]
       
Derivatives, Assets        
Derivatives 262.4 [2] 200.7 [2]    
Recurring [Member] | Fair Value [Member] | Available-for-sale embedded derivatives [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - available-for-sale 255.7 [2] 248.1 [2]    
Recurring [Member] | Fair Value [Member] | FIA embedded derivatives, included in contractholder funds [Member]
       
Derivatives, Liabilities        
Derivative investments 1,639.6 [2] 1,550.8 [2]    
Recurring [Member] | Fair Value [Member] | Future contracts [Member]
       
Derivatives, Liabilities        
Derivative investments   0.9 [2]    
Recurring [Member] | Fair Value [Member] | Asset-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,418.4 [2] 1,027.9 [2]    
Recurring [Member] | Fair Value [Member] | Commercial mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 546.2 [2] 553.8 [2]    
Recurring [Member] | Fair Value [Member] | Corporates [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 10,791.3 [2] 11,009.0 [2]    
Recurring [Member] | Fair Value [Member] | Hybrids [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 466.9 [2] 528.2 [2]    
Recurring [Member] | Fair Value [Member] | Municipals [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,077.7 [2] 1,224.0 [2]    
Recurring [Member] | Fair Value [Member] | Agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 126.0 [2] 155.0 [2]    
Recurring [Member] | Fair Value [Member] | Non-agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,298.5 [2] 660.6 [2]    
Recurring [Member] | Carrying Amount [Member]
       
Assets        
Cash and cash equivalents 1,475.0 [1],[2] 1,470.7 [1],[2]    
Contingent purchase price reduction receivable 41.0 [2] 41.0 [2]    
Fixed maturity securities, available-for-sale:        
Asset-backed loans 241.6 [2] 180.1 [2]    
Total financial assets 18,552.9 [2] 18,433.3 [2]    
Liabilities        
Total debt 4,596.7 [2] 2,167.0 [1],[2]    
Derivatives, Liabilities        
Equity conversion feature of preferred stock 202.7 [2] 232.0 [2]    
Redeemable preferred stock, excluding equity conversion feature 326.8 [2] 319.2 [2]    
Investment contracts, included in contractholder funds 13,770.3 [2] 13,739.6 [2]    
Total financial liabilities 20,550.0 [2] 18,019.5 [2]    
Recurring [Member] | Carrying Amount [Member] | U.S. Government securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 458.5 [2] 930.4 [2]    
Recurring [Member] | Carrying Amount [Member] | Foreign exchange forward agreements [Member]
       
Derivatives, Assets        
Derivatives 3.2 [2] 1.2 [2]    
Derivatives, Liabilities        
Derivative investments 4.8 [2] 10.0 [2]    
Recurring [Member] | Carrying Amount [Member] | Commodity swap and option agreements [Member]
       
Derivatives, Assets        
Derivatives 0.4 [2] 2.0 [2]    
Derivatives, Liabilities        
Derivative investments 9.1 [2]    [2]    
Recurring [Member] | Carrying Amount [Member] | Call options [Member]
       
Derivatives, Assets        
Derivatives 262.4 [2] 200.7 [2]    
Recurring [Member] | Carrying Amount [Member] | Available-for-sale embedded derivatives [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - available-for-sale 255.7 [2] 248.1 [2]    
Recurring [Member] | Carrying Amount [Member] | FIA embedded derivatives, included in contractholder funds [Member]
       
Derivatives, Liabilities        
Derivative investments 1,639.6 [2] 1,550.8 [2]    
Recurring [Member] | Carrying Amount [Member] | Future contracts [Member]
       
Derivatives, Liabilities        
Derivative investments   0.9 [2]    
Recurring [Member] | Carrying Amount [Member] | Asset-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,418.4 [2] 1,027.9 [2]    
Recurring [Member] | Carrying Amount [Member] | Commercial mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 546.2 [2] 553.8 [2]    
Recurring [Member] | Carrying Amount [Member] | Corporates [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 10,791.3 [2] 11,009.0 [2]    
Recurring [Member] | Carrying Amount [Member] | Hybrids [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 466.9 [2] 528.2 [2]    
Recurring [Member] | Carrying Amount [Member] | Municipals [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,077.7 [2] 1,224.0 [2]    
Recurring [Member] | Carrying Amount [Member] | Agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 126.0 [2] 155.0 [2]    
Recurring [Member] | Carrying Amount [Member] | Non-agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,298.5 [2] 660.6 [2]    
Recurring [Member] | Equity securities [Member] | Fair Value [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - trading 57.7 [2] 146.8 [2]    
Recurring [Member] | Equity securities [Member] | Carrying Amount [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - trading 57.7 [2] 146.8 [2]    
Recurring [Member] | Fixed maturities securities [Member] | Fair Value [Member]
       
Fixed maturity securities, available-for-sale:        
U.S. Treasuries and certificate of deposit, held-to-maturity   35.0 [2]    
Recurring [Member] | Fixed maturities securities [Member] | Carrying Amount [Member]
       
Fixed maturity securities, available-for-sale:        
U.S. Treasuries and certificate of deposit, held-to-maturity   35.0 [2]    
Recurring [Member] | Policy loans [Member] | Fair Value [Member]
       
Fixed maturity securities, available-for-sale:        
Policy loans and other invested assets 32.4 [2] 18.8 [2]    
Recurring [Member] | Policy loans [Member] | Carrying Amount [Member]
       
Fixed maturity securities, available-for-sale:        
Policy loans and other invested assets 32.4 [2] 18.8 [2]    
Recurring [Member] | Level 1 [Member]
       
Assets        
Cash and cash equivalents 1,475.0 [1],[2] 1,468.4 [1],[2]    
Contingent purchase price reduction receivable    [2]    [2]    
Fixed maturity securities, available-for-sale:        
Asset-backed loans    [2]    [2]    
Total financial assets 1,882.0 [2] 2,545.6 [2]    
Liabilities        
Total debt    [2] 524.0 [1],[2]    
Derivatives, Liabilities        
Equity conversion feature of preferred stock    [2]    [2]    
Redeemable preferred stock, excluding equity conversion feature    [2]    [2]    
Investment contracts, included in contractholder funds    [2]    [2]    
Total financial liabilities    [2] 524.0 [2]    
Recurring [Member] | Level 1 [Member] | U.S. Government securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 349.3 [2] 930.4 [2]    
Recurring [Member] | Level 1 [Member] | Foreign exchange forward agreements [Member]
       
Derivatives, Assets        
Derivatives    [2]    [2]    
Derivatives, Liabilities        
Derivative investments    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Commodity swap and option agreements [Member]
       
Derivatives, Assets        
Derivatives    [2]    [2]    
Derivatives, Liabilities        
Derivative investments    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Call options [Member]
       
Derivatives, Assets        
Derivatives    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Available-for-sale embedded derivatives [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | FIA embedded derivatives, included in contractholder funds [Member]
       
Derivatives, Liabilities        
Derivative investments    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Future contracts [Member]
       
Derivatives, Liabilities        
Derivative investments      [2]    
Recurring [Member] | Level 1 [Member] | Asset-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Corporates [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Hybrids [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Municipals [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Non-agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 1 [Member] | Equity securities [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - trading 57.7 [2] 146.8 [2]    
Recurring [Member] | Level 1 [Member] | Fixed maturities securities [Member]
       
Fixed maturity securities, available-for-sale:        
U.S. Treasuries and certificate of deposit, held-to-maturity      [2]    
Recurring [Member] | Level 1 [Member] | Policy loans [Member]
       
Fixed maturity securities, available-for-sale:        
Policy loans and other invested assets    [2]    [2]    
Recurring [Member] | Level 2 [Member]
       
Assets        
Cash and cash equivalents    [1],[2] 2.3 [1],[2]    
Contingent purchase price reduction receivable    [2]    [2]    
Fixed maturity securities, available-for-sale:        
Asset-backed loans    [2]    [2]    
Total financial assets 15,977.9 [2] 15,482.8 [2]    
Liabilities        
Total debt 4,881.4 [2] 1,804.8 [1],[2]    
Derivatives, Liabilities        
Equity conversion feature of preferred stock    [2]    [2]    
Redeemable preferred stock, excluding equity conversion feature    [2]    [2]    
Investment contracts, included in contractholder funds    [2]    [2]    
Total financial liabilities 4,895.3 [2] 1,815.7 [2]    
Recurring [Member] | Level 2 [Member] | U.S. Government securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 109.2 [2]    [2]    
Recurring [Member] | Level 2 [Member] | Foreign exchange forward agreements [Member]
       
Derivatives, Assets        
Derivatives 3.2 [2] 1.2 [2]    
Derivatives, Liabilities        
Derivative investments 4.8 [2] 10.0 [2]    
Recurring [Member] | Level 2 [Member] | Commodity swap and option agreements [Member]
       
Derivatives, Assets        
Derivatives 0.4 [2] 2.0 [2]    
Derivatives, Liabilities        
Derivative investments 9.1 [2]    [2]    
Recurring [Member] | Level 2 [Member] | Call options [Member]
       
Derivatives, Assets        
Derivatives 262.4 [2] 200.7 [2]    
Recurring [Member] | Level 2 [Member] | Available-for-sale embedded derivatives [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - available-for-sale 245.7 [2] 248.1 [2]    
Recurring [Member] | Level 2 [Member] | FIA embedded derivatives, included in contractholder funds [Member]
       
Derivatives, Liabilities        
Derivative investments    [2]    [2]    
Recurring [Member] | Level 2 [Member] | Future contracts [Member]
       
Derivatives, Liabilities        
Derivative investments   0.9 [2]    
Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,413.1 [2] 1,012.0 [2]    
Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 540.0 [2] 548.8 [2]    
Recurring [Member] | Level 2 [Member] | Corporates [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 10,434.8 [2] 10,873.7 [2]    
Recurring [Member] | Level 2 [Member] | Hybrids [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 466.9 [2] 519.4 [2]    
Recurring [Member] | Level 2 [Member] | Municipals [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,077.7 [2] 1,224.0 [2]    
Recurring [Member] | Level 2 [Member] | Agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 126.0 [2] 155.0 [2]    
Recurring [Member] | Level 2 [Member] | Non-agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 1,298.5 [2] 660.6 [2]    
Recurring [Member] | Level 2 [Member] | Equity securities [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - trading    [2]    [2]    
Recurring [Member] | Level 2 [Member] | Fixed maturities securities [Member]
       
Fixed maturity securities, available-for-sale:        
U.S. Treasuries and certificate of deposit, held-to-maturity   35.0 [2]    
Recurring [Member] | Level 2 [Member] | Policy loans [Member]
       
Fixed maturity securities, available-for-sale:        
Policy loans and other invested assets    [2]    [2]    
Recurring [Member] | Level 3 [Member]
       
Assets        
Cash and cash equivalents    [1],[2]    [1],[2]    
Contingent purchase price reduction receivable 41.0 [2] 41.0 [2]    
Fixed maturity securities, available-for-sale:        
Asset-backed loans 241.6 [2] 180.1 [2]    
Total financial assets 693.0 [2] 404.9 [2]    
Liabilities        
Total debt    [2]    [1],[2]    
Derivatives, Liabilities        
Equity conversion feature of preferred stock 202.7 [2] 232.0 [2]    
Redeemable preferred stock, excluding equity conversion feature 379.4 [2] 368.9 [2]    
Investment contracts, included in contractholder funds 12,288.1 [2] 12,271.9 [2]    
Total financial liabilities 14,509.8 [2] 14,423.6 [2]    
Recurring [Member] | Level 3 [Member] | U.S. Government securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Foreign exchange forward agreements [Member]
       
Derivatives, Assets        
Derivatives    [2]    [2]    
Derivatives, Liabilities        
Derivative investments    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Commodity swap and option agreements [Member]
       
Derivatives, Assets        
Derivatives    [2]    [2]    
Derivatives, Liabilities        
Derivative investments    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Call options [Member]
       
Derivatives, Assets        
Derivatives    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Available-for-sale embedded derivatives [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - available-for-sale 10.0 [2]    [2]    
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member]
       
Derivatives, Liabilities        
Derivative investments 1,639.6 [2] 1,550.8 [2]    
Recurring [Member] | Level 3 [Member] | Future contracts [Member]
       
Derivatives, Liabilities        
Derivative investments      [2]    
Recurring [Member] | Level 3 [Member] | Asset-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 5.3 [2] 15.9 [2]    
Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 6.2 [2] 5.0 [2]    
Recurring [Member] | Level 3 [Member] | Corporates [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 356.5 [2] 135.3 [2]    
Recurring [Member] | Level 3 [Member] | Hybrids [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale 0 [2] 8.8 [2]    
Recurring [Member] | Level 3 [Member] | Municipals [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Non-agency residential mortgage-backed securities [Member]
       
Fixed maturity securities, available-for-sale:        
Fixed maturity securities, available-for-sale    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Equity securities [Member]
       
Fixed maturity securities, available-for-sale:        
Equity securities - trading    [2]    [2]    
Recurring [Member] | Level 3 [Member] | Fixed maturities securities [Member]
       
Fixed maturity securities, available-for-sale:        
U.S. Treasuries and certificate of deposit, held-to-maturity      [2]    
Recurring [Member] | Level 3 [Member] | Policy loans [Member]
       
Fixed maturity securities, available-for-sale:        
Policy loans and other invested assets $ 32.4 [2] $ 18.8 [2]    
[1] The fair values of cash equivalents, short-term investments and debt set forth above are generally based on quoted or observed market prices.
[2] 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.