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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Contractholder Funds and Furutre Policy Benefits (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2012
Sep. 30, 2014
Minimum
Sep. 30, 2014
Maximum
Sep. 30, 2014
Indexed Universal Life [Member]
Minimum
Sep. 30, 2014
Indexed Universal Life [Member]
Maximum
Accounting Policies [Abstract]            
Interest crediting rate, policyholder liabilities     0.00% 6.00% 0.00% 6.00%
Reserves for funding agreements, total $ 525.8 $ 554.9        
Fair value of callateral investments $ 573.2 $ 604.9