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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
	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

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- Definition

Letter Of Credit

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- Definition

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- Definition

Reinsurance Arrangement In Percentage

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- Definition

Reinsurance Gain Deferred

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- Definition

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- Definition

Upfront Arrangement Fees Incurred In Connection With Credit Facility

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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

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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

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