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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  | $ 5.2 | [1] | $ 19.1 | [2] | $ 0.0 |
Assets |  |  |  |  |  |  |
Cash and cash equivalents |  | 497.3 |  | 661.2 |  | 728.8 | $ 677.0
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Asset Backed Loans And Other Invested Assets |  | 35.0 |  | 226.7 |  |  |
Funds Withheld Receivable |  | 1,650.4 |  | 1,710.1 |  |  |
Assets, Fair Value Disclosure |  | 78.1 |  | 91.6 |  |  |
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, Transfers, Net |  |  |  |  |  | 0.0 |
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 |  | 0.0 | [1] | 19.1 | [2] |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] | 8.5 |  |  |  |  |
Asset Backed Loans And Other Invested Assets | [3] | 35.0 |  | 226.7 |  |  |
Liabilities |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure | [3],[4] | 5,729.2 |  | 6,170.1 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [3] | 922.9 |  | 960.3 |  |  |
Reported Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] | 8.5 |  |  |  |  |
Asset Backed Loans And Other Invested Assets | [3] | 35.0 |  | 226.7 |  |  |
Liabilities |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure | [3],[4] | 5,430.9 |  | 5,984.6 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [3] | 988.3 |  | 1,084.5 |  |  |
Policy Loans [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] |  |  | 9.0 |  |  |
Policy Loans [Member] | Reported Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] |  |  | 9.0 |  |  |
Other invested assets | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] |  |  | 2.5 |  |  |
Other invested assets | Reported Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] |  |  | 2.5 |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure | [3],[4] | 5,700.1 |  | 6,071.0 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] | 8.5 |  |  |  |  |
Asset Backed Loans And Other Invested Assets | [3] | 35.0 |  | 226.7 |  |  |
Liabilities |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure | [3],[4] | 29.1 |  | 99.1 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [3] | 922.9 |  | 960.3 |  |  |
Fair Value, Inputs, Level 3 [Member] | Policy Loans [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] |  |  | 9.0 |  |  |
Fair Value, Inputs, Level 3 [Member] | Other invested assets |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | [3] |  |  | 2.5 |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Funds Withheld Receivable |  | 1,535.1 |  | 1,638.1 |  |  |
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities |  | 0.0 |  | 14.1 |  |  |
Fair Value, Measurements, Recurring | Call Options Within Funds Withheld Receivable [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 11.3 |  | 5.4 |  |  |
Fair Value, Measurements, Recurring | Foreign exchange forward agreements |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 2.0 |  | 12.6 |  |  |
Fair Value, Measurements, Recurring | Commodity Option [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 2.9 |  | 0.0 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 0.1 |  | 5.6 |  |  |
Fair Value, Measurements, Recurring | Call options |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 5.9 |  | 1.0 |  |  |
Fair Value, Measurements, Recurring | Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 1.1 |  | 2.6 |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Recurring |  | 1,561.0 |  | 1,700.2 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 766.2 |  | 792.3 |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 631.8 |  | 629.2 |  |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts | Foreign exchange forward agreements |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 5.8 |  | 6.0 |  |  |
Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Trading Securities |  | 0.0 |  | 32.8 |  |  |
Fair Value, Measurements, Recurring | Other invested assets |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Other invested assets |  | 0.0 |  | 2.8 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Funds Withheld Receivable |  | 69.9 |  | 8.4 |  |  |
Assets, Fair Value Disclosure, Recurring |  | 69.9 |  | 41.2 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 0.0 |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Call Options Within Funds Withheld Receivable [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Call options |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | FIA embedded derivatives, included in contractholder funds |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 131.2 |  | 142.3 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  |  |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Equity securities |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Trading Securities |  | 0.0 |  | 32.8 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other invested assets |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Other invested assets |  | 0.0 |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Funds Withheld Receivable |  | 1,387.1 |  | 1,555.0 |  |  |
Assets, Fair Value Disclosure, Recurring |  | 1,413.0 |  | 1,567.4 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 3.2 |  | 20.8 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities |  | 0.0 |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Call Options Within Funds Withheld Receivable [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 11.3 |  | 5.4 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign exchange forward agreements |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 2.0 |  | 12.6 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Commodity Option [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 2.9 |  | 0.0 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 0.1 |  | 5.6 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Call options |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 5.9 |  | 1.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 1.1 |  | 2.6 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contracts | Foreign exchange forward agreements |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 5.8 |  | 6.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Funds Withheld Receivable |  | 78.1 |  | 74.7 |  |  |
Assets, Fair Value Disclosure, Recurring |  | 78.1 |  | 91.6 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 763.0 |  | 771.5 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities |  | 0.0 |  | 14.1 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Call Options Within Funds Withheld Receivable [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Call options |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | FIA embedded derivatives, included in contractholder funds |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 131.2 |  | 142.3 |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contracts | Foreign exchange forward agreements |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  |  |  | 0.0 |  |  |
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 |  | 0.0 |  |  |  |  |
Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Other invested assets |  | 0.0 |  | 2.8 |  |  |
Funds Withheld Receivable |  | 5.4 |  | 19.2 |  |  |
Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  | 631.8 |  | 629.2 |  |  |
Broker Quoted [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Assets, Fair Value Disclosure |  | $ 0.0 |  | $ 14.1 |  |  |
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, Transfers, Net |  |  |  |  |  | $ 0.0 |
[1] | (a) During Fiscal 2016, the net transfer to Level 3 was exclusively from Level 2. The transfers into Level 3 were related to changes in the primary pricing source and changes in the observability of external information used in determining the fair value.
[2] | (a) During Fiscal 2015, the net transfer to Level 3 was related to a loan receivable previously classified as a related party loan.
[3] | The carrying amounts of cash and cash equivalents, trade receivables, accounts payable and accrued investment income approximate fair value due to their short duration and, accordingly, they are not presented in the tables above. (b) The fair values of debt set forth above are generally based on quoted or observed market prices.
[4] | The fair values of debt set forth above are generally based on quoted or observed market prices.

X
- Definition Asset backed loans and other invested assets. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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