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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Funds Withheld Receivable | $ 1,664.0 | $ 1,710.1
FIA embedded derivatives [Member] | Contractholder funds [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 139.9 | 142.3
Derivatives designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 7.5 | 5.6
Total liability derivatives | 7.1 | 9.6
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 1.2 | 1.4
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.7 | 1.2
Derivatives designated as hedging instruments [Member] | Foreign Exchange Forward [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.8 | 0.4
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 6.7 | 5.2
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.0 | 1.5
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.1 | 0.0
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 4.3 | 4.7
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.8 | 0.8
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 19.2 | 20.3
Total liability derivatives | 147.6 | 152.1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.6 | 0.1
Not Designated as Hedging Instrument [Member] | Call options [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 2.2 | 1.0
Not Designated as Hedging Instrument [Member] | Call options [Member] | Funds withheld for reinsurance liability [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 8.1 | 5.4
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.1 | 0.4
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Receivables, net [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 1.3 | 7.9
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.0 | 0.1
Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Funds Withheld Receivable | 1,664.0 | 1,710.1
Assets, Fair Value Disclosure, Recurring | 1,683.2 | 1,780.1
Liabilities, Fair Value Disclosure, Recurring | 776.6 | 781.3
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 10.3 | 6.4
Fair Value, Measurements, Recurring [Member] | Commodity Option [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 1.3 | 7.9
Derivative Liability | 5.1 | 5.6
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 0.7 | 1.6
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 1.9 | 2.6
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Funds Withheld Receivable | 53.9 | 45.8
Assets, Fair Value Disclosure, Recurring | 53.9 | 78.6
Liabilities, Fair Value Disclosure, Recurring | 0.0 | 0.0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 0.0 | 0.0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 139.9 | 142.3
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability |  | 0.0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Funds Withheld Receivable | 1,535.3 | 1,579.9
Assets, Fair Value Disclosure, Recurring | 1,554.5 | 1,600.2
Liabilities, Fair Value Disclosure, Recurring | 7.7 | 9.8
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 10.3 | 6.4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Option [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 1.3 | 7.9
Derivative Liability | 5.1 | 5.6
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 0.7 | 1.6
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 1.9 | 2.6
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Funds Withheld Receivable | 74.8 | 84.4
Assets, Fair Value Disclosure, Recurring | 74.8 | 101.3
Liabilities, Fair Value Disclosure, Recurring | 768.9 | 771.5
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 0.0 | 0.0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 139.9 | 142.3
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Available-for-sale Securities | 0.0 | 14.1
Corporate Debt Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Available-for-sale Securities | 0.0 | 0.0
Corporate Debt Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Available-for-sale Securities | 0.0 | 14.1
Equity [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Trading Securities | 0.0 | 32.8
Equity [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Trading Securities | 0.0 | 32.8
Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Other invested assets | 0.0 | 2.8
Other Invested Assets [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Other invested assets | 0.0 | 0.0
Other Invested Assets [Member] | Other Invested Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Other invested assets | 0.0 |
Other Invested Assets [Member] | Option Pricing [Member] | Other Invested Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Other invested assets |  | 2.8
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | $ 629.0 | $ 629.2

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