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Reinsurance - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Oct. 31, 2014
Sep. 30, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Contractholder funds $ 17,703.9   $ 16,463.5
Ability Re [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   $ 368.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves   $ 346.9