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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, 2015 | Sep. 30, 2014 | Jun. 16, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Document Period End Date | Jun. 30, 2015 |  |
Assets, Fair Value Disclosure | $ 1,148.1 | $ 1,066.0 |
Other invested assets | 442.4 | 165.0 |
Liabilities |  |  |
Liabilities, Fair Value Disclosure | 2,768.3 | 2,059.4 |
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 19,238.2 | 18,501.7 |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure | 0.0 | 41.5 |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | $ 1,887.5 | 1,792.9 |
Municipal [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Broker-quoted |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | $ 821.6 | 636.9 |
Commercial Mortgage Backed Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Broker-quoted |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | $ 9,551.1 | 9,795.8 |
Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 883.8 | 848.0 |
Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Matrix Pricing |  |
Assets, Fair Value Disclosure | $ 33.1 | 2.0 |
Hybrids [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | $ 1,241.1 | 1,316.1 |
Municipal Bonds [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Broker-quoted |  |
Municipals [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | $ 1,450.6 | 1,259.8 |
Equities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Broker-quoted |  |
Other Invested Assets [Member] | Black Scholes Model [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Black Scholes model |  |
Other Invested Assets [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Discounted cash flow |  |
Contingent Purchase Price Reduction Receivable [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Discounted cash flow |  |
Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Equity securities - available-for-sale | $ 579.6 | 663.6 |
Nomura Fund Linked Note [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Liability | 11.7 |  | $ 11.3
Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Derivative Liability | $ 2,173.7 | $ 1,908.1 |
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] | Asset-backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 0.00% | 100.00% |
Minimum [Member] | Asset-backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 0.00% | 0.00% |
Minimum [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 106.00% | 0.00% |
Offered quotes | 100.00% | 105.00% |
Minimum [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 67.00% |  |
Offered quotes | 75.00% |  |
Minimum [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes |  | 62.00% |
Minimum [Member] | Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  | 0.00% |
Minimum [Member] | Hybrids [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  |  |
Minimum [Member] | Contingent Purchase Price Reduction Receivable [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Probability of collection | 0.00% | 88.00% |
Minimum [Member] | Fixed Index Annuity [Member] |  |  |
Liabilities |  |  |
Market value of option | 0.00% | 0.00% |
SWAP rates |  |  |
Surrender rates | 0.50% |  |
Minimum [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |  |
Liabilities |  |  |
SWAP rates |  | 2.00% |
Surrender rates |  | 0.50% |
Maximum [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 0.00% | 109.00% |
Maximum [Member] | Asset-backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 0.00% | 0.00% |
Maximum [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 123.00% | 0.00% |
Offered quotes | 121.00% | 121.00% |
Maximum [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 150.00% |  |
Offered quotes | 123.00% |  |
Maximum [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes |  | 120.00% |
Maximum [Member] | Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  | 0.00% |
Maximum [Member] | Hybrids [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  |  |
Maximum [Member] | Contingent Purchase Price Reduction Receivable [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Probability of collection | 0.00% | 96.00% |
Expected term | 5 days |  |
Discount rate | 1.00% | 1.00% |
Credit insurance risk premium | 7.00% | 12.00% |
Maximum [Member] | Contingent Purchase Price Reduction Receivable [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Expected term |  | 4 months 5 days |
Maximum [Member] | Fixed Index Annuity [Member] |  |  |
Liabilities |  |  |
Market value of option | 42.00% | 50.00% |
SWAP rates |  |  |
Surrender rates | 75.00% |  |
Maximum [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |  |
Liabilities |  |  |
SWAP rates |  | 3.00% |
Surrender rates |  | 75.00% |
Weighted Average [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 100.00% | 101.00% |
Weighted Average [Member] | Asset-backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 110.00% | 0.00% |
Weighted Average [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 115.00% | 0.00% |
Offered quotes | 114.00% | 118.00% |
Weighted Average [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 103.00% |  |
Offered quotes | 103.00% |  |
Weighted Average [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes |  | 100.00% |
Weighted Average [Member] | Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  | 142.00% |
Weighted Average [Member] | Municipal Debt Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 115.00% |  |
Weighted Average [Member] | Hybrids [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  | 107.00% |
Weighted Average [Member] | Equities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 100.00% | 100.00% |
Weighted Average [Member] | Nomura Fund Linked Note [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 100.00% | 100.00% |
Weighted Average [Member] | Contingent Purchase Price Reduction Receivable [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Probability of collection | 94.00% | 92.00% |
Weighted Average [Member] | Fixed Index Annuity [Member] |  |  |
Liabilities |  |  |
Market value of option | 3.00% | 3.00% |
SWAP rates | 2.00% |  |
Mortality multiplier | 80.00% | 80.00% |
Surrender rates | 7.00% |  |
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% |
Surrender rates |  | 7.00% |
Front Street Future Policyholder Benefits Reserve [Member] | Minimum [Member] |  |  |
Liabilities |  |  |
Fair Value Measurements Non Performance Spread | 0.50% | 0.50% |
Front Street Future Policyholder Benefits Reserve [Member] | Maximum [Member] |  |  |
Liabilities |  |  |
Fair Value Measurements Non Performance Spread | 1.50% | 1.50% |
Front Street Future Policyholder Benefits Reserve [Member] | Weighted Average [Member] |  |  |
Liabilities |  |  |
Risk margin for uncertainty | 1.00% | 0.50% |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | $ 527.8 | $ 279.3 |
Level 1 [Member] | Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Equity securities - available-for-sale | 26.7 | 59.2 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 17,562.3 | 17,156.4 |
Level 2 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,854.4 | 1,755.9 |
Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 681.5 | 553.8 |
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 | 8,634.2 | 8,945.8 |
Level 2 [Member] | Hybrids [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,241.1 | 1,316.1 |
Level 2 [Member] | Municipals [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,413.1 | 1,222.6 |
Level 2 [Member] | Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Equity securities - available-for-sale | 546.9 | 598.4 |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 1,148.1 | 1,066.0 |
Level 3 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 33.1 |  |
Level 3 [Member] | Asset-backed Securities [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 33.1 | 37.0 |
Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 140.1 |  |
Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 140.1 | 83.1 |
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 | 916.9 | 850.0 |
Level 3 [Member] | Hybrids [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] | Municipal Bonds [Member] | Market Pricing [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 37.5 |  |
Level 3 [Member] | Municipals [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities |  | 37.2 |
Level 3 [Member] | Contingent Purchase Price Reduction Receivable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure | 0.0 | 41.5 |
Level 3 [Member] | Available For Sale Embedded Derivatives [Member] | Equity Securities [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Equity securities - available-for-sale | 6.0 | 6.0 |
Level 3 [Member] | Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Derivative Liability | 2,173.7 | 1,908.1 |
Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Derivative Liability | 594.6 | 151.3 |
Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Other invested assets | 14.5 | 13.3 |
Other Invested Assets [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Other invested assets | 0.0 | 0.0 |
Other Invested Assets [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Other invested assets |  | 2.1 |
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 | 14.5 | 11.2 |
Other Invested Assets [Member] | Level 3 [Member] | Other Invested Assets [Member] | Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Other invested assets | 2.8 | $ 0.0 |
Other Invested Assets [Member] | Level 3 [Member] | Nomura Fund Linked Note [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 | $ 11.7 |  |

X
- 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=36462937&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=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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