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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 | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Sep. 30, 2012 | Jan. 01, 2012 | Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Document Period End Date | Jun. 30, 2013 |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents | $ 1,243.7 |  | $ 1,470.7 |  | $ 1,832.8 | $ 1,137.4
Derivatives, Assets |  |  |  |  |  |
Derivatives | 227.4 |  | 200.7 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Asset-backed loans | 430.2 |  | 180.1 |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Equity conversion feature of preferred stock | 147.3 |  | 232.0 |  |  |
Recurring [Member] | Fair Value [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents | 1,243.7 | [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 | 430.2 | [2] | 180.1 | [2] |  |
Total financial assets | 17,895.4 | [2] | 18,433.3 | [2] |  |
Liabilities |  |  |  |  |  |
Total debt | 4,574.3 | [2] | 2,328.8 | [1],[2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Equity conversion feature of preferred stock | 147.3 | [2] | 232.0 | [2] |  |
Redeemable preferred stock, excluding equity conversion feature | 368.9 | [2] | 368.9 | [2] |  |
Investment contracts, included in contractholder funds | 12,354.5 | [2] | 12,271.9 | [2] |  |
Total financial liabilities | 19,038.3 | [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 | 394.0 | [2] | 930.4 | [2] |  |
Recurring [Member] | Fair Value [Member] | Foreign exchange forward agreements [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 5.8 | [2] | 1.2 | [2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 4.5 | [2] | 10.0 | [2] |  |
Recurring [Member] | Fair Value [Member] | Commodity swap and option agreements [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 4.4 | [2] | 2.0 | [2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 2.5 | [2] |  | [2] |  |
Recurring [Member] | Fair Value [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 227.4 | [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 | 269.8 | [2] | 248.1 | [2] |  |
Recurring [Member] | Fair Value [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 1,585.9 | [2] | 1,550.8 | [2] |  |
Recurring [Member] | Fair Value [Member] | Future contracts [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 0.4 | [2] | 0.9 | [2] |  |
Recurring [Member] | Fair Value [Member] | Asset-backed securities [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 1,437.5 | [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 | 523.9 | [2] | 553.8 | [2] |  |
Recurring [Member] | Fair Value [Member] | Corporates [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 10,212.8 | [2] | 11,009.0 | [2] |  |
Recurring [Member] | Fair Value [Member] | Hybrids [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 508.3 | [2] | 528.2 | [2] |  |
Recurring [Member] | Fair Value [Member] | Municipals [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 1,036.9 | [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 | 111.0 | [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 | 1,353.9 | [2] | 660.6 | [2] |  |
Recurring [Member] | Carrying Amount [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents | 1,243.7 | [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 | 430.2 | [2] | 180.1 | [2] |  |
Total financial assets | 17,895.4 | [2] | 18,433.3 | [2] |  |
Liabilities |  |  |  |  |  |
Total debt | 4,554.3 | [2] | 2,167.0 | [1],[2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Equity conversion feature of preferred stock | 147.3 | [2] | 232.0 | [2] |  |
Redeemable preferred stock, excluding equity conversion feature | 325.4 | [2] | 319.2 | [2] |  |
Investment contracts, included in contractholder funds | 13,756.7 | [2] | 13,739.6 | [2] |  |
Total financial liabilities | 20,377.0 | [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 | 394.0 | [2] | 930.4 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Foreign exchange forward agreements [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 5.8 | [2] | 1.2 | [2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 4.5 | [2] | 10.0 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Commodity swap and option agreements [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 4.4 | [2] | 2.0 | [2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 2.5 | [2] |  | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 227.4 | [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 | 269.8 | [2] | 248.1 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 1,585.9 | [2] | 1,550.8 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Future contracts [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 0.4 | [2] | 0.9 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Asset-backed securities [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 1,437.5 | [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 | 523.9 | [2] | 553.8 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Corporates [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 10,212.8 | [2] | 11,009.0 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Hybrids [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 508.3 | [2] | 528.2 | [2] |  |
Recurring [Member] | Carrying Amount [Member] | Municipals [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 1,036.9 | [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 | 111.0 | [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 | 1,353.9 | [2] | 660.6 | [2] |  |
Recurring [Member] | Equity securities [Member] | Fair Value [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Equity securities - trading | 67.2 | [2] | 146.8 | [2] |  |
Recurring [Member] | Equity securities [Member] | Carrying Amount [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Equity securities - trading | 67.2 | [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 | 27.6 | [2] | 18.8 | [2] |  |
Recurring [Member] | Policy loans [Member] | Carrying Amount [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Policy loans and other invested assets | 27.6 | [2] | 18.8 | [2] |  |
Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents | 1,243.7 | [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 | 1,494.5 | [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 | 183.6 | [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] |  | [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 | 67.2 | [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 | 15,440.4 | [2] | 15,482.8 | [2] |  |
Liabilities |  |  |  |  |  |
Total debt | 4,574.3 | [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 | 4,581.7 | [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 | 210.4 | [2] |  | [2] |  |
Recurring [Member] | Level 2 [Member] | Foreign exchange forward agreements [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 5.8 | [2] | 1.2 | [2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 4.5 | [2] | 10.0 | [2] |  |
Recurring [Member] | Level 2 [Member] | Commodity swap and option agreements [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 4.4 | [2] | 2.0 | [2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 2.5 | [2] |  | [2] |  |
Recurring [Member] | Level 2 [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives | 227.4 | [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 | 258.1 | [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 | 0.4 | [2] | 0.9 | [2] |  |
Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 1,432.4 | [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 | 518.0 | [2] | 548.8 | [2] |  |
Recurring [Member] | Level 2 [Member] | Corporates [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 9,773.8 | [2] | 10,873.7 | [2] |  |
Recurring [Member] | Level 2 [Member] | Hybrids [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 508.3 | [2] | 519.4 | [2] |  |
Recurring [Member] | Level 2 [Member] | Municipals [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 1,036.9 | [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 | 111.0 | [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 | 1,353.9 | [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 | 430.2 | [2] | 180.1 | [2] |  |
Total financial assets | 960.5 | [2] | 404.9 | [2] |  |
Liabilities |  |  |  |  |  |
Total debt |  | [2] |  | [1],[2] |  |
Derivatives, Liabilities |  |  |  |  |  |
Equity conversion feature of preferred stock | 147.3 | [2] | 232.0 | [2] |  |
Redeemable preferred stock, excluding equity conversion feature | 368.9 | [2] | 368.9 | [2] |  |
Investment contracts, included in contractholder funds | 12,354.5 | [2] | 12,271.9 | [2] |  |
Total financial liabilities | 14,456.6 | [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 | 11.7 | [2] |  | [2] |  |
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments | 1,585.9 | [2] | 1,550.8 | [2] |  |
Recurring [Member] | Level 3 [Member] | Future contracts [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative investments |  | [2] |  | [2] |  |
Recurring [Member] | Level 3 [Member] | Asset-backed securities [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 5.1 | [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 | 5.9 | [2] | 5.0 | [2] |  |
Recurring [Member] | Level 3 [Member] | Corporates [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Fixed maturity securities, available-for-sale | 439.0 | [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 | $ 27.6 | [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 The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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