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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 | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Document Period End Date | Sep. 30, 2014 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | $ (23.9) | $ (53.0) | $ (731.8) | [1] |
Assets |  |  |  |  |
Cash and cash equivalents | 1,319.2 | 1,899.7 | 1,470.7 |  | 1,137.4
Derivatives, Assets |  |  |  |  |
Derivatives | 296.3 | 221.8 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Asset Backed Loans And Other Invested Assets | 811.6 | 560.4 |  |  |
Other invested assets | 165.0 | 31.2 |  |  |
Assets, Fair Value Disclosure | 1,066.0 |  | 523.5 |  |
Derivatives, Liabilities |  |  |  |  |
Equity Conversion Option Of Preferred Stock |  | 330.8 |  |  |
Asset-backed securities |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | (3.8) | (10.5) | (737.9) | [1] |
Commercial mortgage-backed securities |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | (6.0) |  |  |  |
Corporates |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | (14.1) | (33.8) | 18.9 | [1] |
Hybrids |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  | (8.7) | 3.7 | [1] |
Non-agency residential mortgage-backed securities |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  |  | (2.9) | [1] |
Other invested assets |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 |  |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 1,319.2 | 1,899.7 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Asset Backed Loans And Other Invested Assets | 811.6 | 560.4 |  |  |
Liabilities |  |  |  |  |
Debt Instrument, Fair Value Disclosure | 5,308.5 | 4,773.2 |  |  |
Derivatives, Liabilities |  |  |  |  |
Redeemable preferred stock, excluding equity conversion feature |  | 377.1 |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 13,108.8 | 12,378.6 |  |  |
Reported Value Measurement [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 1,319.2 | 1,899.7 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Asset Backed Loans And Other Invested Assets | 811.6 | 560.4 |  |  |
Liabilities |  |  |  |  |
Debt Instrument, Fair Value Disclosure | 5,157.8 | 4,896.1 |  |  |
Derivatives, Liabilities |  |  |  |  |
Redeemable preferred stock, excluding equity conversion feature |  | 329.4 |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 14,555.4 | 13,703.8 |  |  |
Policy loans | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Policy loans and other invested assets | 151.7 | 31.2 |  |  |
Policy loans | Reported Value Measurement [Member] |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Policy loans and other invested assets | 151.7 | 31.2 |  |  |
Other invested assets |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Trading Securities | 165.0 | 31.2 |  |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 1,319.2 | 1,899.7 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Asset Backed Loans And Other Invested Assets |  |  |  |  |
Liabilities |  |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Redeemable preferred stock, excluding equity conversion feature |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure |  |  |  |  |
Fair Value, Inputs, Level 1 | Policy loans |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Policy loans and other invested assets |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Asset Backed Loans And Other Invested Assets |  |  |  |  |
Liabilities |  |  |  |  |
Debt Instrument, Fair Value Disclosure | 5,308.5 | 4,773.2 |  |  |
Derivatives, Liabilities |  |  |  |  |
Redeemable preferred stock, excluding equity conversion feature |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Policy loans |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Policy loans and other invested assets |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Asset Backed Loans And Other Invested Assets | 811.6 | 560.4 |  |  |
Liabilities |  |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Redeemable preferred stock, excluding equity conversion feature |  | 377.1 |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 13,108.8 | 12,378.6 |  |  |
Fair Value, Inputs, Level 3 [Member] | Policy loans |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Policy loans and other invested assets | 151.7 | 31.2 |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |
Assets |  |  |  |  |
Contingent purchase price reduction receivable | 41.5 | 41.0 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Funds Withheld Receivable | 154.4 |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Equity Conversion Option Of Preferred Stock |  | 330.8 |  |  |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 1,792.9 | 1,523.1 |  |  |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 636.9 | 454.4 |  |  |
Fair Value, Measurements, Recurring | Corporates |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 9,795.8 | 9,418.3 |  |  |
Fair Value, Measurements, Recurring | Hybrids |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 1,316.1 | 428.8 |  |  |
Fair Value, Measurements, Recurring | Municipals |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 1,259.8 | 1,007.0 |  |  |
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 107.3 | 98.6 |  |  |
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 2,006.7 | 1,368.0 |  |  |
Fair Value, Measurements, Recurring | Foreign exchange forward agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 0.6 | 1.8 |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 0.1 | 10.0 |  |  |
Fair Value, Measurements, Recurring | Commodity swap and option agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 3.2 | 4.1 |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 0.4 | 2.4 |  |  |
Fair Value, Measurements, Recurring | Call options |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 296.3 | 221.8 |  |  |
Fair Value, Measurements, Recurring | Available-for-sale |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Equity securities - available-for-sale | 663.6 | 271.0 |  |  |
Fair Value, Measurements, Recurring | FIA embedded derivatives, included in contractholder funds |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 1,908.1 | 1,544.4 |  |  |
Fair Value, Measurements, Recurring | Future contracts |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 0.5 | 1.0 |  |  |
Fair Value, Measurements, Recurring | Interest Rate Swap [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 1.8 |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Assets, Fair Value Disclosure, Recurring | 18,501.7 | 15,921.2 |  |  |
Derivatives, Liabilities |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 2,062.2 | 1,888.6 |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 151.3 |  |  |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 12.8 |  |  |  |
Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Trading Securities | 104.5 | 81.5 |  |  |
Fair Value, Measurements, Recurring | Other invested assets |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Other invested assets | 13.3 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |
Assets |  |  |  |  |
Contingent purchase price reduction receivable |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Funds Withheld Receivable | 0 |  |  |  |
Assets, Fair Value Disclosure, Recurring | 279.3 | 861.7 |  |  |
Derivatives, Liabilities |  |  |  |  |
Equity Conversion Option Of Preferred Stock |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 0 | 0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Asset-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Commercial mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Corporates |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Hybrids |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Municipals |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Non-agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Foreign exchange forward agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Commodity swap and option agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Call options |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Available-for-sale |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Equity securities - available-for-sale | 59.2 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | FIA embedded derivatives, included in contractholder funds |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Future contracts |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Interest Rate Swap [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Foreign exchange contracts |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Equity securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Trading Securities | 104.5 | 70.8 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other invested assets |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Other invested assets | 0 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Assets |  |  |  |  |
Contingent purchase price reduction receivable |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Funds Withheld Receivable | 154.4 |  |  |  |
Assets, Fair Value Disclosure, Recurring | 17,156.4 | 14,536.0 |  |  |
Derivatives, Liabilities |  |  |  |  |
Equity Conversion Option Of Preferred Stock |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 2.8 | 13.4 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 1,755.9 | 1,518.1 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Commercial mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 553.8 | 448.7 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Corporates |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 8,945.8 | 8,957.2 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Hybrids |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 1,316.1 | 428.8 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Municipals |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 1,222.6 | 1,007.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 107.3 | 98.6 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Non-agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 2,006.7 | 1,368.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign exchange forward agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 0.6 | 1.8 |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 0.1 | 10.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Commodity swap and option agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 3.2 | 4.1 |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 0.4 | 2.4 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Call options |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 296.3 | 221.8 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Available-for-sale |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Equity securities - available-for-sale | 598.4 | 271.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | FIA embedded derivatives, included in contractholder funds |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Future contracts |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 0.5 | 1.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 1.8 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contracts |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives | 12.8 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Equity securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Trading Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Other invested assets |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Other invested assets | 2.1 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Assets |  |  |  |  |
Contingent purchase price reduction receivable | 41.5 | 41.0 |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Funds Withheld Receivable | 0 |  |  |  |
Assets, Fair Value Disclosure, Recurring | 1,066.0 | 523.5 |  |  |
Derivatives, Liabilities |  |  |  |  |
Equity Conversion Option Of Preferred Stock |  | 330.8 |  |  |
Liabilities, Fair Value Disclosure, Recurring | 2,059.4 | 1,875.2 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 37.0 | 5.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Commercial mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 83.1 | 5.7 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Corporates |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 850.0 | 461.1 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Hybrids |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 0 | 0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Municipals |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 37.2 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Non-agency residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Foreign exchange forward agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Commodity swap and option agreements |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Call options |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Available-for-sale |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Equity securities - available-for-sale | 6.0 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | FIA embedded derivatives, included in contractholder funds |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 1,908.1 | 1,544.4 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability | 151.3 |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Future contracts |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |
Derivative Liability |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contracts |  |  |  |  |
Derivatives, Assets |  |  |  |  |
Derivatives |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Equity securities |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Trading Securities |  | 10.7 |  |  |
Option Pricing [Member] | Other invested assets |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Assets, Fair Value Disclosure |  | 0 |  |  |
Option Pricing [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Other invested assets | Other invested assets |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Other invested assets | 11.2 |  |  |  |
U.S. Government | Fair Value, Measurements, Recurring |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 296.0 | 1,001.8 |  |  |
U.S. Government | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 115.6 | 790.9 |  |  |
U.S. Government | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities | 180.4 | 210.9 |  |  |
U.S. Government | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
[1] | (a)The net transfers in and out of Level 3 during Fiscal 2012 was exclusively to or from Level 2.

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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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