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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 | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Equity Securities | Sep. 30, 2014 Contingent purchase price reduction receivable | Sep. 30, 2013 Contingent purchase price reduction receivable | Sep. 30, 2014 FIA embedded derivatives, included in contractholder funds | Sep. 30, 2013 FIA embedded derivatives, included in contractholder funds | Sep. 30, 2014 FIA embedded derivatives, included in contractholder funds Fair Value, Measurements, Recurring | Sep. 30, 2013 FIA embedded derivatives, included in contractholder funds Fair Value, Measurements, Recurring | Sep. 30, 2014 Equity conversion feature of preferred stock | Sep. 30, 2013 Equity conversion feature of preferred stock | Sep. 30, 2014 Minimum Asset-backed securities | Sep. 30, 2013 Minimum Asset-backed securities | Sep. 30, 2014 Minimum Commercial mortgage-backed securities | Sep. 30, 2014 Minimum Corporates | Sep. 30, 2013 Minimum Corporates | Sep. 30, 2013 Minimum Hybrids | Sep. 30, 2014 Minimum Contingent purchase price reduction receivable | Sep. 30, 2013 Minimum Contingent purchase price reduction receivable | Sep. 30, 2014 Minimum FIA embedded derivatives, included in contractholder funds | Sep. 30, 2013 Minimum FIA embedded derivatives, included in contractholder funds | Sep. 30, 2014 Minimum Equity conversion feature of preferred stock | Sep. 30, 2013 Minimum Equity conversion feature of preferred stock | Sep. 30, 2014 Maximum Asset-backed securities | Sep. 30, 2013 Maximum Asset-backed securities | Sep. 30, 2014 Maximum Commercial mortgage-backed securities | Sep. 30, 2013 Maximum Commercial mortgage-backed securities | Sep. 30, 2014 Maximum Corporates | Sep. 30, 2013 Maximum Corporates | Sep. 30, 2013 Maximum Hybrids | Sep. 30, 2014 Maximum Contingent purchase price reduction receivable | Sep. 30, 2013 Maximum Contingent purchase price reduction receivable | Sep. 30, 2014 Maximum FIA embedded derivatives, included in contractholder funds | Sep. 30, 2013 Maximum FIA embedded derivatives, included in contractholder funds | Sep. 30, 2014 Maximum Equity conversion feature of preferred stock | Sep. 30, 2013 Maximum Equity conversion feature of preferred stock | Sep. 30, 2013 Weighted average | Sep. 30, 2014 Weighted average Asset-backed securities | Sep. 30, 2013 Weighted average Asset-backed securities | Sep. 30, 2014 Weighted average Commercial mortgage-backed securities | Sep. 30, 2014 Weighted average Corporates | Sep. 30, 2013 Weighted average Corporates | Sep. 30, 2014 Weighted average Equity Securities | Sep. 30, 2014 Weighted average Municipal Debt Securities [Member] | Sep. 30, 2013 Weighted average Hybrids | Sep. 30, 2014 Weighted average Contingent purchase price reduction receivable | Sep. 30, 2013 Weighted average Contingent purchase price reduction receivable | Sep. 30, 2014 Weighted average FIA embedded derivatives, included in contractholder funds | Sep. 30, 2013 Weighted average FIA embedded derivatives, included in contractholder funds | Sep. 30, 2014 Weighted average Equity conversion feature of preferred stock | Sep. 30, 2013 Weighted average Equity conversion feature of preferred stock | Sep. 30, 2014 Monte Carlo simulation / Option model Equity conversion feature of preferred stock | Sep. 30, 2014 Broker Quoted [Member] Asset-backed securities | Sep. 30, 2013 Broker Quoted [Member] Asset-backed securities | Sep. 30, 2014 Broker Quoted [Member] Commercial mortgage-backed securities | Sep. 30, 2013 Broker Quoted [Member] Commercial mortgage-backed securities | Sep. 30, 2014 Broker Quoted [Member] Corporates | Sep. 30, 2013 Broker Quoted [Member] Corporates | Sep. 30, 2014 Broker Quoted [Member] Municipal | Sep. 30, 2013 Broker Quoted [Member] Municipal | Sep. 30, 2014 Broker Quoted [Member] Equity Securities | Sep. 30, 2013 Broker Quoted [Member] Equity Securities | Sep. 30, 2014 Discounted Cash Flow [Member] Contingent purchase price reduction receivable | Sep. 30, 2014 Discounted Cash Flow [Member] FIA embedded derivatives, included in contractholder funds | Sep. 30, 2014 Matrix Pricing [Member] Corporates | Sep. 30, 2013 Matrix Pricing [Member] Corporates | Sep. 30, 2014 Option Pricing [Member] Equity Securities | Sep. 30, 2014 Option Pricing [Member] Other invested assets | Sep. 30, 2013 Option Pricing [Member] Other invested assets | Sep. 30, 2014 Fair Value, Inputs, Level 3 [Member] FIA embedded derivatives, included in contractholder funds Fair Value, Measurements, Recurring | Sep. 30, 2013 Fair Value, Inputs, Level 3 [Member] FIA embedded derivatives, included in contractholder funds Fair Value, Measurements, Recurring | Sep. 30, 2014 Fair Value, Inputs, Level 3 [Member] Front Street Future Policyholder Benefits Reserve [Member] Fair Value, Measurements, Recurring | Sep. 30, 2014 Other invested assets Fair Value, Measurements, Recurring | Sep. 30, 2014 Other invested assets Fair Value, Inputs, Level 3 [Member] Option Pricing [Member] Fair Value, Measurements, Recurring | Sep. 30, 2014 Front Street Future Policyholder Benefits Reserve [Member] Minimum | Sep. 30, 2014 Front Street Future Policyholder Benefits Reserve [Member] Maximum | Sep. 30, 2014 Front Street Future Policyholder Benefits Reserve [Member] Weighted average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date | Sep. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Technique |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Monte Carlo simulation / Option model |  |  | Broker-quoted |  | Matrix pricing |  | Broker-quoted |  | Broker-quoted |  | Discounted cash flow | Discounted cash flow | Broker-quoted |  | Option Pricing | Black Scholes model |  |  |  | Discounted cash flow |  |  |  |  |
Other invested assets | $ 165.0 | $ 31.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.3 | $ 11.2 |  |  |
Assets, Fair Value Disclosure | 1,066.0 |  | 523.5 | 10.7 | 41.5 | 41.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37.0 | 5.0 | 83.1 | 5.7 | 848.0 | 404.5 | 37.2 | 0 | 6.0 | 0 |  |  | 2.0 | 56.6 |  |  | 0 |  |  |  |  |  |  |  |
Probability of collection |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88.00% | 88.00% |  |  |  |  |  |  |  |  |  |  |  | 96.00% | 96.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 92.00% | 92.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 months 15 days | 9 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit insurance risk premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quoted prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  | 113.00% |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 90.00% |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offered quotes |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  | 105.00% |  | 90.00% |  |  |  |  |  |  |  | 109.00% |  | 121.00% | 96.00% | 120.00% | 131.00% |  |  |  |  |  |  |  |  | 101.00% | 103.00% | 118.00% | 142.00% | 97.00% | 100.00% | 107.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free discount factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.999 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-adjusted discount factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.995 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upward movement factor (Mu) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Downward movement (Md) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of upward movement (Pu) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of downward movement (Pd) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure | 2,059.4 |  | 1,875.2 |  |  |  | 1,908.1 | 1,544.4 |  |  | 0 | 330.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  |  |  |  |  | $ 1,908.1 | $ 1,544.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,908.1 | $ 1,544.4 | $ 151.3 |  |  |  |  |
Market value of option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 38.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 1.50% |
Risk margin for uncertainty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50%
Annualized volatility of equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash accretion rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Calibration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 inputs market value of option. + References No definition available. + Details
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- Definition Fair Value Inputs, Risk-adjusted Discount Factor + References No definition available. + Details
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- Definition Fair value measurements annualized volatility of equity. + References No definition available. + Details
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- Definition Credit insurance risk premium. + References No definition available. + Details
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- Definition Discount yield. + References No definition available. + Details
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- Definition Mortality multiplier. + References No definition available. + Details
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- Definition Fair value measurements probability of collection. + References No definition available. + Details
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- Definition Fair value measurements swap rates. + 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 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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: 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 3: 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=35750535&loc=d3e13495-108611 Reference 4: 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=34720828&loc=SL20225862-175312 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 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + 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=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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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