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Reinsurance - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Raven Re | Dec. 31, 2012 Fgl Reinsurance Agreement With Fsr | Sep. 30, 2014 Fgl Reinsurance Agreement With Fsr | Dec. 31, 2013 Bankers Life Insurance Company [Member] | Sep. 30, 2014 Bankers Life Insurance Company [Member] | Sep. 30, 2014 Nomura | Mar. 31, 2014 Nomura | Oct. 01, 2012 Nomura | Jun. 17, 2013 Wilton Re Recission [Member] Wilton Reassurance Company | Mar. 31, 2014 reinsurance recission [Member] | Sep. 30, 2013 reinsurance recission [Member] | Sep. 30, 2012 reinsurance recission [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Reinsurance |  |  |  | $ 1,400.0 |  | $ 153.0 | $ 153.0 |  |  |  | $ 6.4 |  |  |
Contractholder funds | 16,463.5 | 15,248.2 |  |  |  |  |  |  |  |  |  |  |  |
ReinsuranceRecissionGainLoss |  |  |  |  |  |  |  |  |  |  | 1.9 |  |  |
Pre-tax gain on reinsurance transactions deferred |  |  |  |  |  |  |  |  |  |  |  | 14.3 | 12.6 | 18.0
Excess Statutory Capital over Requirement |  |  | 3.5 |  |  |  |  |  |  |  |  |  |  |
Reserve financing facility |  |  |  |  |  |  |  |  | 251.3 | 295.0 |  |  |  |
Upfront structuring fee |  |  |  |  |  |  |  | 2.8 |  |  |  |  |  |
Letter of Credit Future Quarterly Reductions |  |  |  |  |  |  |  | $ 6.3 |  |  |  |  |  |
Reinsurance arrangment in percentage |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |

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- Definition Excess Statutory Capital over Requirement + References No definition available. + Details
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- Definition Letter Of Credit + References No definition available. + Details
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- Definition Letter of Credit Future Quarterly Reductions + References No definition available. + Details
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- Definition Reinsurance Arrangement In Percentage + References No definition available. + Details
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- Definition Reinsurance Gain Deferred + References No definition available. + Details
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- Definition ReinsuranceRecissionGainLoss + References No definition available. + Details
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- Definition Upfront Arrangement Fees Incurred In Connection With Credit Facility + References No definition available. + Details
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- Definition Cash payments made for reinsurance during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The total liability as of the balance sheet date of amounts due policy holders, excluding future policy benefits and claims, including unpaid policy dividends, retrospective refunds, and undistributed earnings on participating business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13,14) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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