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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.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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