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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Sep. 30, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Funds Withheld Receivable | $ 1,661.0 | $ 1,710.1
Assets, Fair Value Disclosure | 74.7 | 101.3
Liabilities |  |
Liabilities, Fair Value Disclosure | 742.4 | 771.5
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 1,684.4 | 1,780.1
Funds Withheld Receivable | $ 1,661.0 | 1,710.1
Funds withheld for reinsurance liability [Member] | Market Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Market pricing |
Funds withheld for reinsurance liability [Member] | NAV [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Loan value |
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] | Discounted Cash Flow [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Discounted Cash Flow |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Available-for-sale Securities | $ 0.0 | $ 14.1
Corporate Debt Securities [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Other Invested Assets [Member] | Discounted Cash Flow [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Discounted Cash Flow |
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] | Funds Withheld Receivables [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 6.00% | 6.00%
Quoted prices | 100.00% | 100.00%
Offered quotes | 94.00% | 99.00%
Minimum [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes |  |
Minimum [Member] | Other Invested Assets [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Probability of collection |  |
Minimum [Member] | Fixed Index Annuity [Member] |  |
Liabilities |  |
Market value of option | 0.00% | 0.00%
SWAP rates | 1.00% |
Surrender rates | 0.50% | 0.50%
Maximum [Member] | Funds Withheld Receivables [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 13.00% | 12.00%
Quoted prices | 122.00% | 122.00%
Offered quotes | 107.00% | 103.00%
Maximum [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes |  |
Maximum [Member] | Other Invested Assets [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Probability of collection |  |
Maximum [Member] | Fixed Index Annuity [Member] |  |
Liabilities |  |
Market value of option | 24.00% | 32.00%
SWAP rates | 2.00% |
Surrender rates | 75.00% | 75.00%
Weighted Average [Member] | Funds Withheld Receivables [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 7.00% | 8.00%
Quoted prices | 111.00% | 112.00%
Offered quotes | 99.00% | 101.00%
Weighted Average [Member] | Loans and Finance Receivables [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes | 100.00% | 100.00%
Weighted Average [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes |  | 83.00%
Weighted Average [Member] | Other Invested Assets [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Probability of collection |  | 50.00%
Discount rate |  | 10.00%
Weighted Average [Member] | Policy Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 100.00% | 100.00%
Weighted Average [Member] | Fixed Index Annuity [Member] |  |
Liabilities |  |
Market value of option | 1.00% | 1.00%
SWAP rates | 1.00% |
Mortality multiplier | 80.00% | 80.00%
Surrender rates | 13.00% | 13.00%
Fair Value Measurements Non Performance Spread | 0.25% | 0.25%
Weighted Average [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |
Liabilities |  |
SWAP rates |  | 2.00%
Front Street Future Policyholder Benefits Reserve [Member] | Minimum [Member] |  |
Liabilities |  |
Fair Value Measurements Non Performance Spread | 0.29% | 0.16%
Risk margin for uncertainty | 0.50% | 0.50%
Front Street Future Policyholder Benefits Reserve [Member] | Maximum [Member] |  |
Liabilities |  |
Fair Value Measurements Non Performance Spread | 0.43% | 0.46%
Risk margin for uncertainty | 1.00% | 1.00%
Front Street Future Policyholder Benefits Reserve [Member] | Weighted Average [Member] |  |
Liabilities |  |
Risk margin for uncertainty |  |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 1,466.7 | $ 1,600.2
Funds Withheld Receivable | 1,443.3 | 1,579.9
Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Available-for-sale Securities | 0.0 | 0.0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 74.7 | 101.3
Funds Withheld Receivable | 74.7 | 84.4
Level 3 [Member] | Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Funds Withheld Receivable | 14.7 | 19.5
Other invested assets | 0.0 | 2.8
Level 3 [Member] | Funds Withheld Receivables [Member] | Market Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 2.8 | 9.7
Level 3 [Member] | Funds Withheld Receivables [Member] | NAV [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 8.6 | 9.0
Level 3 [Member] | Funds Withheld Receivables [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 4.9 | 6.7
Level 3 [Member] | Funds Withheld Receivables [Member] | Matrix Pricing [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 43.7 | 39.5
Level 3 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Available-for-sale Securities | 0.0 | 14.1
Level 3 [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 0.0 | 14.1
Level 3 [Member] | Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Derivative Liability | 133.5 | 142.3
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 | 608.9 | 629.2
Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other invested assets | 0.0 | 2.8
Other Invested Assets [Member] | Level 3 [Member] | Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other invested assets | $ 0.0 |
Other Invested Assets [Member] | Level 3 [Member] | Other Invested Assets [Member] | Option Pricing [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other invested assets |  | $ 2.8

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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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + 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=49121117&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=49121117&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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