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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Non-Recurring Basis (Detail) - Valuation Technique [Domain] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2015 | Sep. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  |  | Jun. 30, 2015 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 1,148.1 |  | $ 930.6 |  | $ 1,148.1 |  | $ 930.6 |  | $ 1,222.9 | $ 1,066.0 | $ 755.6 | $ 523.5
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 1,293.2 |  | 1,455.9 |  | 1,293.2 |  | 1,455.9 |  |  | 1,319.2 |  | 1,899.7
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 220.4 |  |  |  | 220.4 |  |  |  |  | 296.3 |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed loans |  | 490.0 |  |  |  | 490.0 |  |  |  |  | 811.6 |  |
Other invested assets |  | 442.4 |  |  |  | 442.4 |  |  |  |  | 165.0 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | (13.8) |  | 1.5 |  | (4.9) |  | 2.1 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (24.1) |  | 15.9 |  | 4.3 |  | 20.5 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  |  | 191.0 |  | 186.8 |  | 425.3 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | (1.6) |  | (1.0) |  | (1.6) |  | (1.0) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (53.4) |  | (13.5) |  | (87.1) |  | (15.9) |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | 18.1 | [1] | (18.9) | [2] | (15.4) | [3] | (23.9) | [4] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | 2,768.3 |  | 2,019.4 |  | 2,768.3 |  | 2,019.4 |  | 2,801.9 | 2,059.4 | 2,234.5 | 1,875.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (75.4) |  | 112.9 |  | 240.3 |  | 340.9 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0.0 |  |  |  | 0.0 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  | 77.6 |  | 0.0 |  | 514.6 |  | 150.6 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  | (35.8) |  | (328.0) |  | (46.0) |  | (347.3) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  | 0.0 | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] |  |  |  |
Asset-backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 33.1 |  | 5.9 |  | 33.1 |  | 5.9 |  | 34.3 | 37.0 | 10.7 | 5.0
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0.0 |  |  |  | 0.1 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (0.1) |  |  |  | (0.1) |  | (0.3) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0.0 |  |  |  | 6.7 |  | 5.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (0.1) |  |  |  | (0.2) |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | (1.0) | [3] | (4.8) | [2] | (10.4) | [3] | (3.8) | [4] |  |  |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 140.1 |  | 83.9 |  | 140.1 |  | 83.9 |  | 142.5 | 83.1 |  | 5.7
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (1.9) |  | 0.1 |  | 0.4 |  | 0.4 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  |  | 83.8 |  | 57.7 |  | 83.8 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (0.5) |  |  |  | (1.1) |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | [4] |  |  |  |  |  |  | (6.0) |  |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 916.9 |  | 745.2 |  | 916.9 |  | 745.2 |  | 941.1 | 850.0 | 657.0 | 461.1
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0.0 |  |  |  | 2.3 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (20.0) |  | 14.4 |  | 3.3 |  | 18.4 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0.0 |  | 88.9 |  | 122.4 |  | 283.2 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | (1.6) |  | (1.0) |  | (1.6) |  | (1.0) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (2.6) |  |  |  | (35.4) |  | (2.4) |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  | (14.1) | [2] | (24.1) | [3] | (14.1) | [4] |  |  |  |
Municipals [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 37.5 |  | 36.5 |  | 37.5 |  | 36.5 |  | 39.8 | 37.2 | 35.6 |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0.0 |  |  |  | 0.0 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (2.1) |  | 0.9 |  | 0.7 |  | 1.5 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0.0 |  |  |  | 0.0 |  | 35.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0.0 |  |  |  | 0.0 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (0.2) |  |  |  | (0.4) |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | 0.0 | [1] |  |  | 0.0 | [3] |  |  |  |  |  |
Held for trading [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 6.0 |  | 0.0 |  | 6.0 |  | 0.0 |  | 6.0 | 6.0 | 10.8 | 10.7
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  | 1.2 |  |  |  | 1.3 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0.0 |  | 1.5 |  | 0.0 |  | 1.5 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0.0 |  | (13.5) |  | 0.0 |  | (13.5) |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | 0.0 | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] |  |  |  |
Nomura Fund Linked Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 14.5 |  | 11.6 |  | 14.5 |  | 11.6 |  | 12.2 | 11.2 | 0.0 | 0.0
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0.0 |  | 11.3 |  | 0.0 |  | 11.3 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | 19.1 | [1] | 0.0 | [1] | 19.1 | [3] | 0.0 | [1] |  |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | (16.8) |  | 0.3 |  | (15.8) |  | 0.3 |  |  |  |  |
Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities |  |  |  |  |  |  |  |  |  |  | 165.0 |  |
Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | [5],[6] | 6,941.9 |  |  |  | 6,941.9 |  |  |  |  | 5,308.5 |  |
Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed loans | [5] | 490.0 |  |  |  | 490.0 |  |  |  |  | 151.7 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | [5],[6] | 65.4 |  |  |  | 65.4 |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [5] | 14,016.1 |  |  |  | 14,016.1 |  |  |  |  | 13,108.8 |  |
Level 3 [Member] | Policy loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Policy loans and other invested assets | [5] | 427.9 |  |  |  | 427.9 |  |  |  |  | 811.6 |  |
Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure |  | 0.0 |  |  |  | 0.0 |  |  |  |  | 41.5 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 2,773.1 |  |  |  | 2,773.1 |  |  |  |  | 2,062.2 |  |
Funds Withheld Receivable | [7] | 641.7 |  |  |  | 641.7 |  |  |  |  | 154.4 |  |
Assets, Fair Value Disclosure, Recurring |  | 19,238.2 |  |  |  | 19,238.2 |  |  |  |  | 18,501.7 |  |
Recurring [Member] | U.S. Government securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 596.3 |  |  |  | 596.3 |  |  |  |  | 296.0 |  |
Recurring [Member] | Foreign exchange forward agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  | 12.8 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 1.0 |  |  |  | 1.0 |  |  |  |  | 0.5 |  |
Recurring [Member] | Commodity Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 10.3 |  |  |  | 10.3 |  |  |  |  | 3.2 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 1.6 |  |  |  | 1.6 |  |  |  |  | 0.4 |  |
Recurring [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 220.4 |  |  |  | 220.4 |  |  |  |  | 296.3 |  |
Recurring [Member] | Available For Sale Embedded Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities - available-for-sale |  | 579.6 |  |  |  | 579.6 |  |  |  |  | 663.6 |  |
Recurring [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 2,173.7 |  |  |  | 2,173.7 |  |  |  |  | 1,908.1 |  |
Recurring [Member] | Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.6 |  |
Recurring [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 2.2 |  |  |  | 2.2 |  |  |  |  | 1.8 |  |
Recurring [Member] | Asset-backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 1,887.5 |  |  |  | 1,887.5 |  |  |  |  | 1,792.9 |  |
Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 821.6 |  |  |  | 821.6 |  |  |  |  | 636.9 |  |
Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 9,551.1 |  |  |  | 9,551.1 |  |  |  |  | 9,795.8 |  |
Recurring [Member] | Hybrids [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 1,241.1 |  |  |  | 1,241.1 |  |  |  |  | 1,316.1 |  |
Recurring [Member] | Municipals [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 1,450.6 |  |  |  | 1,450.6 |  |  |  |  | 1,259.8 |  |
Recurring [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 2,175.4 |  |  |  | 2,175.4 |  |  |  |  | 2,114.0 |  |
Recurring [Member] | Equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities |  | 41.9 |  |  |  | 41.9 |  |  |  |  | 104.5 |  |
Recurring [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Other invested assets |  | 14.5 |  |  |  | 14.5 |  |  |  |  | 13.3 |  |
Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets | [5] | 1,293.2 |  |  |  | 1,293.2 |  |  |  |  | 1,319.2 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | [5] | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Funds Withheld Receivable | [7] | 45.8 |  |  |  | 45.8 |  |  |  |  | 0.0 |  |
Assets, Fair Value Disclosure, Recurring |  | 527.8 |  |  |  | 527.8 |  |  |  |  | 279.3 |  |
Recurring [Member] | Level 1 [Member] | U.S. Government securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 413.4 |  |  |  | 413.4 |  |  |  |  | 115.6 |  |
Recurring [Member] | Level 1 [Member] | Available For Sale Embedded Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities - available-for-sale |  | 26.7 |  |  |  | 26.7 |  |  |  |  | 59.2 |  |
Recurring [Member] | Level 1 [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 1,293.2 |  |  |  | 1,293.2 |  |  |  |  | 1,319.2 |  |
Recurring [Member] | Level 1 [Member] | Equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities |  | 41.9 |  |  |  | 41.9 |  |  |  |  | 104.5 |  |
Recurring [Member] | Level 1 [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Other invested assets |  | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets | [5] | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | [5] | 6,941.9 |  |  |  | 6,941.9 |  |  |  |  | 5,308.5 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 4.8 |  |  |  | 4.8 |  |  |  |  | 2.8 |  |
Funds Withheld Receivable | [7] | 595.9 |  |  |  | 595.9 |  |  |  |  | 154.4 |  |
Assets, Fair Value Disclosure, Recurring |  | 17,562.3 |  |  |  | 17,562.3 |  |  |  |  | 17,156.4 |  |
Recurring [Member] | Level 2 [Member] | U.S. Government securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 182.9 |  |  |  | 182.9 |  |  |  |  | 180.4 |  |
Recurring [Member] | Level 2 [Member] | Foreign exchange forward agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  | 12.8 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 1.0 |  |  |  | 1.0 |  |  |  |  | 0.5 |  |
Recurring [Member] | Level 2 [Member] | Commodity Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 10.3 |  |  |  | 10.3 |  |  |  |  | 3.2 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 1.6 |  |  |  | 1.6 |  |  |  |  | 0.4 |  |
Recurring [Member] | Level 2 [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 220.4 |  |  |  | 220.4 |  |  |  |  | 296.3 |  |
Recurring [Member] | Level 2 [Member] | Available For Sale Embedded Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities - available-for-sale |  | 546.9 |  |  |  | 546.9 |  |  |  |  | 598.4 |  |
Recurring [Member] | Level 2 [Member] | Future Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  |  |  |  |  |  |  | 0.1 |  |
Recurring [Member] | Level 2 [Member] | Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.6 |  |
Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 2.2 |  |  |  | 2.2 |  |  |  |  | 1.8 |  |
Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 1,854.4 |  |  |  | 1,854.4 |  |  |  |  | 1,755.9 |  |
Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 681.5 |  |  |  | 681.5 |  |  |  |  | 553.8 |  |
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 8,634.2 |  |  |  | 8,634.2 |  |  |  |  | 8,945.8 |  |
Recurring [Member] | Level 2 [Member] | Hybrids [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 1,241.1 |  |  |  | 1,241.1 |  |  |  |  | 1,316.1 |  |
Recurring [Member] | Level 2 [Member] | Municipals [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 1,413.1 |  |  |  | 1,413.1 |  |  |  |  | 1,222.6 |  |
Recurring [Member] | Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 2,175.4 |  |  |  | 2,175.4 |  |  |  |  | 2,114.0 |  |
Recurring [Member] | Level 2 [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Recurring [Member] | Level 2 [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Other invested assets |  |  |  |  |  |  |  |  |  |  | 2.1 |  |
Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets | [5] | 917.9 |  |  |  | 917.9 |  |  |  |  | 963.3 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | [5] | 14,081.5 |  |  |  | 14,081.5 |  |  |  |  | 13,108.8 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 2,768.3 |  |  |  | 2,768.3 |  |  |  |  | 2,059.4 |  |
Funds Withheld Receivable | [7] | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Assets, Fair Value Disclosure, Recurring |  | 1,148.1 |  |  |  | 1,148.1 |  |  |  |  | 1,066.0 |  |
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 2,173.7 |  |  |  | 2,173.7 |  |  |  |  | 1,908.1 |  |
Recurring [Member] | Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 594.6 |  |  |  | 594.6 |  |  |  |  | 151.3 |  |
Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 33.1 |  |  |  | 33.1 |  |  |  |  |  |  |
Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 140.1 |  |  |  | 140.1 |  |  |  |  |  |  |
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 916.9 |  |  |  | 916.9 |  |  |  |  | 850.0 |  |
Recurring [Member] | Level 3 [Member] | Hybrids [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Recurring [Member] | Level 3 [Member] | Municipals [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  |  |  |  |  |  |  |  |  |  | 37.2 |  |
Recurring [Member] | Level 3 [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Recurring [Member] | Level 3 [Member] | Other Invested Assets [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Other invested assets |  | 14.5 |  |  |  | 14.5 |  |  |  |  | 11.2 |  |
Contingent Purchase Price Reduction Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  |  | 41.5 |  |  |  | 41.5 |  | 47.0 | 41.5 | 41.5 | 41.0
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 3.0 |  |  |  | 8.5 |  | 0.5 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (50.0) |  |  |  | (50.0) |  |  |  |  |  |  |
Contingent Purchase Price Reduction Receivable [Member] | Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure |  | 0.0 |  |  |  | 0.0 |  |  |  |  | 41.5 |  |
FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | 2,173.7 |  | 1,864.5 |  | 2,173.7 |  | 1,864.5 |  | 2,217.4 | 1,908.1 | 1,718.7 | 1,544.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (43.7) |  | 145.8 |  | 265.6 |  | 320.1 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  |  |  | 0.0 | [2] |  |  | 0.0 | [4] |  |  |  |
Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | 594.6 |  | 154.9 |  | 594.6 |  | 154.9 |  | $ 584.5 | 151.3 | 151.0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (31.7) |  | 5.1 |  | (25.3) |  | 8.1 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  | 77.6 |  |  |  | 514.6 |  | 150.6 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  | (35.8) |  | (1.2) |  | (46.0) |  | (3.8) |  |  |  |  |
Equity conversion feature of preferred stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  | $ 364.8 | $ 330.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  |  |  | (38.0) |  |  |  | 12.7 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  |  |  | (326.8) |  |  |  | (343.5) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  |  |  | $ 0.0 | [2] |  |  | $ 0.0 | [4] |  |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed loans | [5] | 490.0 |  |  |  | 490.0 |  |  |  |  | 151.7 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | [5],[6] | 7,007.3 |  |  |  | 7,007.3 |  |  |  |  | 5,308.5 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [5] | 14,016.1 |  |  |  | 14,016.1 |  |  |  |  | 13,108.8 |  |
Estimate of Fair Value Measurement [Member] | Policy loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Policy loans and other invested assets | [5] | 427.9 |  |  |  | 427.9 |  |  |  |  | 811.6 |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets | [5] | 2,211.1 |  |  |  | 2,211.1 |  |  |  |  | 2,282.5 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | [5] | 21,023.4 |  |  |  | 21,023.4 |  |  |  |  | 18,417.3 |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Future Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  |  |  |  |  |  |  | 0.1 |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 594.6 |  |  |  | 594.6 |  |  |  |  | 151.3 |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 1,293.2 |  |  |  | 1,293.2 |  |  |  |  | 1,319.2 |  |
Reported Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed loans | [5] | 490.0 |  |  |  | 490.0 |  |  |  |  | 151.7 |  |
Total financial assets | [5] | 2,211.1 |  |  |  | 2,211.1 |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | [5],[6] | 6,832.7 |  |  |  | 6,832.7 |  |  |  |  | 5,157.8 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [5] | 15,530.1 |  |  |  | 15,530.1 |  |  |  |  | 14,555.4 |  |
Financial Liabilities Fair Value Disclosure | [5] | 22,362.8 |  |  |  | 22,362.8 |  |  |  |  |  |  |
Reported Value Measurement [Member] | Policy loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Policy loans and other invested assets | [5] | 427.9 |  |  |  | 427.9 |  |  |  |  | 811.6 |  |
Reported Value Measurement [Member] | Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets | [5] |  |  |  |  |  |  |  |  |  | 2,282.5 |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | [5] |  |  |  |  |  |  |  |  |  | 19,713.2 |  |
Reported Value Measurement [Member] | Recurring [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | $ 1,293.2 |  |  |  | $ 1,293.2 |  |  |  |  | $ 1,319.2 |  |
[1] | (a) During the three months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[2] | (a) The net transfers out of Level 3 for the three months ended June 30, 2014 were exclusively to Level 2.
[3] | (a) During the nine months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[4] | (a) The net transfers out of Level 3 for the nine months ended June 30, 2014 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from Level 3 to Level 2.
[5] | (a)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.
[6] | (b)The fair values of debt set forth above are generally based on quoted or observed market prices.
[7] | (a) included in other assets in the accompanying unaudited condensed Consolidated Balance Sheets.

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