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Reinsurance - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Oct. 17, 2011
Apr. 08, 2011
Jun. 17, 2013
Wilton Reassurance Company
Sep. 30, 2013
Wilton Reassurance Company
Jan. 01, 2013
Fgl Reinsurance Agreement With Fsr
Sep. 30, 2013
Nomura
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                
Payments for reinsurance         $ 6.4   $ 1,400.0  
Contractholder funds 15,290.4 15,248.2       4.5    
ReinsuranceRecissionGainLoss           1.9    
Fair value of insurance transferred assets     580.7 535.8        
Pre-tax gain on reinsurance transactions deferred 18.0              
Reserve financing facility               295.0
Upfront structuring fee               2.8
LetterofCreditFutureQuarterlyReductiun               $ 6.3
Reinsurance arrangment in percentage             10.00%