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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, unless otherwise specified | 3 Months Ended |  |  |  | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2013 Equity Securities [Member] | Sep. 30, 2013 Equity Securities [Member] | Dec. 31, 2013 Broker Quoted [Member] Municipal Bonds [Member] | Dec. 31, 2013 Option Pricing [Member] Equity Securities [Member] | Dec. 31, 2013 Broker Quoted [Member] Asset-backed securities [Member] | Sep. 30, 2013 Broker Quoted [Member] Asset-backed securities [Member] | Dec. 31, 2013 Broker Quoted [Member] Commercial mortgage-backed securities [Member] | Sep. 30, 2013 Broker Quoted [Member] Commercial mortgage-backed securities [Member] | Dec. 31, 2013 Broker Quoted [Member] Corporates [Member] | Sep. 30, 2013 Broker Quoted [Member] Corporates [Member] | Dec. 31, 2013 Market pricing [Member] Corporates [Member] | Sep. 30, 2013 Market pricing [Member] Corporates [Member] | Dec. 31, 2013 Market pricing [Member] Municipal Bonds [Member] | Dec. 31, 2013 Contingent purchase price reduction receivable [Member] | Sep. 30, 2013 Contingent purchase price reduction receivable [Member] | Dec. 31, 2013 Contingent purchase price reduction receivable [Member] Discounted cash flow [Member] | Dec. 31, 2013 Fixed Index Annuity [Member] | Sep. 30, 2013 Fixed Index Annuity [Member] | Dec. 31, 2013 Fixed Index Annuity [Member] Discounted cash flow [Member] | Dec. 31, 2013 Front Street Future Policyholder Benefits Reserve [Member] | Dec. 31, 2013 Equity conversion feature of preferred stock [Member] | Sep. 30, 2013 Equity conversion feature of preferred stock [Member] | Dec. 31, 2013 Equity conversion feature of preferred stock [Member] Monte Carlo simulation / Option model [Member] | Dec. 31, 2013 Minimum [Member] Asset-backed securities [Member] | Dec. 31, 2012 Minimum [Member] Asset-backed securities [Member] | Dec. 31, 2013 Minimum [Member] Corporates [Member] | Dec. 31, 2012 Minimum [Member] Corporates [Member] | Dec. 31, 2012 Minimum [Member] Hybrids [Member] | Dec. 31, 2013 Minimum [Member] Equity Securities [Member] | Dec. 31, 2013 Minimum [Member] Contingent purchase price reduction receivable [Member] | Dec. 31, 2012 Minimum [Member] Contingent purchase price reduction receivable [Member] | Dec. 31, 2013 Minimum [Member] Fixed Index Annuity [Member] | Dec. 31, 2012 Minimum [Member] Fixed Index Annuity [Member] | Dec. 31, 2013 Minimum [Member] Equity conversion feature of preferred stock [Member] | Dec. 31, 2012 Minimum [Member] Equity conversion feature of preferred stock [Member] | Dec. 31, 2013 Maximum [Member] Asset-backed securities [Member] | Dec. 31, 2012 Maximum [Member] Asset-backed securities [Member] | Dec. 31, 2012 Maximum [Member] Commercial mortgage-backed securities [Member] | Dec. 31, 2013 Maximum [Member] Corporates [Member] | Dec. 31, 2012 Maximum [Member] Corporates [Member] | Dec. 31, 2012 Maximum [Member] Hybrids [Member] | Dec. 31, 2013 Maximum [Member] Equity Securities [Member] | Dec. 31, 2013 Maximum [Member] Contingent purchase price reduction receivable [Member] | Dec. 31, 2012 Maximum [Member] Contingent purchase price reduction receivable [Member] | Dec. 31, 2013 Maximum [Member] Fixed Index Annuity [Member] | Dec. 31, 2012 Maximum [Member] Fixed Index Annuity [Member] | Dec. 31, 2013 Maximum [Member] Equity conversion feature of preferred stock [Member] | Dec. 31, 2012 Maximum [Member] Equity conversion feature of preferred stock [Member] | Dec. 31, 2013 Weighted Average [Member] | Dec. 31, 2013 Weighted Average [Member] Asset-backed securities [Member] | Dec. 31, 2012 Weighted Average [Member] Asset-backed securities [Member] | Dec. 31, 2013 Weighted Average [Member] Commercial mortgage-backed securities [Member] | Dec. 31, 2013 Weighted Average [Member] Corporates [Member] | Dec. 31, 2012 Weighted Average [Member] Corporates [Member] | Dec. 31, 2013 Weighted Average [Member] Municipal Debt Securities [Member] | Dec. 31, 2013 Weighted Average [Member] Hybrids [Member] | Dec. 31, 2012 Weighted Average [Member] Hybrids [Member] | Dec. 31, 2013 Weighted Average [Member] Equity Securities [Member] | Dec. 31, 2013 Weighted Average [Member] Contingent purchase price reduction receivable [Member] | Dec. 31, 2012 Weighted Average [Member] Contingent purchase price reduction receivable [Member] | Dec. 31, 2013 Weighted Average [Member] Fixed Index Annuity [Member] | Dec. 31, 2012 Weighted Average [Member] Fixed Index Annuity [Member] | Dec. 31, 2013 Weighted Average [Member] Equity conversion feature of preferred stock [Member] | Dec. 31, 2012 Weighted Average [Member] Equity conversion feature of preferred stock [Member] | Dec. 31, 2013 Front Street Future Policyholder Benefits Reserve [Member] Minimum [Member] | Dec. 31, 2013 Front Street Future Policyholder Benefits Reserve [Member] Maximum [Member] | Dec. 31, 2013 Front Street Future Policyholder Benefits Reserve [Member] Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date | Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Technique |  |  |  |  | Broker-quoted | Option Pricing | Broker-quoted |  |  |  |  |  | Market Pricing |  |  |  |  | Discounted cash flow |  |  | Discounted cash flow |  |  |  | Monte Carlo simulation / Option model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | $ 709.5 | $ 523.5 | $ 10.8 | $ 10.7 |  |  | $ 9.8 | $ 5.0 | $ 6.0 | $ 5.7 | $ 540.9 | $ 404.5 | $ 66.2 | $ 56.6 | $ 34.3 | $ 41.5 | $ 41.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of collection |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88.00% | 88.00% |  |  |  |  |  |  |  |  |  |  |  | 96.00% | 96.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92.00% | 92.00% |  |  |  |  |  |  |
Expected term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months | 9 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit insurance risk premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quoted prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  | 132.00% | 113.00% |  |  |  |  |  |  |  |  |  |  |  |  | 92.00% | 90.00% |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Fair Value Measurements Revenue Multiple |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offered quotes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% | 100.00% | 91.00% | 90.00% |  |  |  |  |  |  |  |  | 107.00% | 107.00% | 96.00% | 115.00% | 131.00% |  |  |  |  |  |  |  |  |  | 101.00% | 101.00% | 102.00% | 99.00% | 97.00% | 98.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |
Fair Value Measurements Probability of Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |
Fair Value Inputs, Risk-free Discount Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.999 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Risk-adjusted Discount Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.995 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Upward Movement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Downward Movement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Probability of Upward Movement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Probability of Downward Movement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure | $ 2,172.6 | $ 1,875.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,644.7 | $ 1,544.4 |  | $ 149.9 | $ 378.0 | $ 330.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value of option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  | 43.00% | 38.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 4.00% |  |  |  |  |
SWAP rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% |  |  |  |  |
Mortality multiplier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% | 80.00% |  |  |  |  |
Surrender rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  |  |  | 75.00% | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  |  |  |  |
Non-performance spread |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.25% |  |  | 0.65% | 1.50% |
Fair Value Measurements Liquidity Spread |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50%
Annualized volatility of equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% | 42.00% |  |  |
Discount yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% | 11.00% |  |  |
Non-cash accretion rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Calibration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.30% |  |  |

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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=25499696&loc=d3e19207-110258 + Details
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