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Fair Value of Financial Instruments - Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Document Period End Date | Mar. 31, 2017 |
Funds Withheld Receivable | $ 1,634.2 | $ 1,650.4
Assets, Fair Value Disclosure | 49.1 | 78.1
Liabilities |  |
Liabilities, Fair Value Disclosure | 782.2 | 763.0
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 1,576.1 | 1,561.0
Funds Withheld Receivable | $ 1,543.4 | 1,535.1
Funds withheld for reinsurance liability [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Funds withheld for reinsurance liability [Member] | Matrix Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Matrix pricing |
Funds withheld for reinsurance liability [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Loan Recovery Value |
Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Derivative Liability | $ 121.0 | $ 131.2
Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Discounted cash flow |
Front Street Future Policyholder Benefits Reserve [Member] | Discounted Cash Flow [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Discounted cash flow |
Minimum [Member] | Loan Participations and Assignments [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 0.00% | 52.00%
Minimum [Member] | Funds withheld for reinsurance liability [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 99.00% | 97.00%
Minimum [Member] | Funds withheld for reinsurance liability [Member] | Matrix Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 100.00% | 98.00%
Minimum [Member] | Funds withheld for reinsurance liability [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 56.00% | 56.00%
Minimum [Member] | Fixed Index Annuity [Member] |  |
Liabilities |  |
Fair Value Inputs Market Value Of Option | 0.00% | 0.00%
Minimum [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |
Liabilities |  |
Fair Value Inputs Surrender Rates | 0.50% | 0.50%
Maximum [Member] | Loan Participations and Assignments [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 0.00% | 100.00%
Maximum [Member] | Funds withheld for reinsurance liability [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 105.00% | 100.00%
Maximum [Member] | Funds withheld for reinsurance liability [Member] | Matrix Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 117.00% | 122.00%
Maximum [Member] | Funds withheld for reinsurance liability [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 100.00% | 100.00%
Maximum [Member] | Fixed Index Annuity [Member] |  |
Liabilities |  |
Fair Value Inputs Market Value Of Option | 24.00% | 27.00%
Maximum [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |
Liabilities |  |
Fair Value Inputs Surrender Rates | 75.00% | 75.00%
Weighted Average [Member] | Loan Participations and Assignments [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 56.00% | 71.00%
Weighted Average [Member] | Funds withheld for reinsurance liability [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 100.00% | 100.00%
Weighted Average [Member] | Funds withheld for reinsurance liability [Member] | Matrix Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 106.00% | 109.00%
Weighted Average [Member] | Funds withheld for reinsurance liability [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 81.00% | 82.00%
Weighted Average [Member] | Fixed Index Annuity [Member] |  |
Liabilities |  |
Fair Value Measurements Non Performance Spread | 0.25% | 0.25%
Fair Value Inputs Mortality Multiplier | 80.00% | 80.00%
Fair Value Measurements Swap Rates | 2.00% | 1.00%
Fair Value Inputs Market Value Of Option | 3.00% | 2.00%
Weighted Average [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |
Liabilities |  |
Fair Value Inputs Surrender Rates | 13.00% | 10.00%
Front Street Future Policyholder Benefits Reserve [Member] | Weighted Average [Member] |  |
Liabilities |  |
Fair Value Measurements Non Performance Spread | 0.35% | 0.32%
Risk margin for uncertainty | 0.50% | 0.50%
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 1,446.5 | $ 1,413.0
Funds Withheld Receivable | 1,413.8 | 1,387.1
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 49.1 | 78.1
Funds Withheld Receivable | 49.1 | 78.1
Level 3 [Member] | Cost Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Funds Withheld Receivable | 5.1 | 5.4
Level 3 [Member] | Funds Withheld Receivables [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 10.0 | 35.7
Level 3 [Member] | Funds Withheld Receivables [Member] | Matrix Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 33.6 | 35.2
Level 3 [Member] | Funds Withheld Receivables [Member] | Cost Approach Valuation Technique [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 0.4 | 1.8
Level 3 [Member] | Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Derivative Liability | 121.0 | 131.2
Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] | Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Derivative Liability | $ 661.2 | $ 631.8

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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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- 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 Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities 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 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: 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 3: 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 4: 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 5: 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 6: 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 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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