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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Benefit Expense and Other Changes in Policy Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]    
Investment Owned, at Fair Value $ 482.2 $ 573.2
Reserves for Contractholder Funding Agreement $ 523.9 $ 525.8
Indexed Universal Life [Member] | Minimum [Member]    
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]    
Interest crediting rate, policyholder liabilities 0.00%  
Indexed Universal Life [Member] | Maximum    
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]    
Interest crediting rate, policyholder liabilities 4.50%  
FIA embedded derivatives, included in contractholder funds | Minimum [Member]    
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]    
Interest Crediting Rates for Funds at Subsidiaries 0.00%  
FIA embedded derivatives, included in contractholder funds | Maximum    
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]    
Interest Crediting Rates for Funds at Subsidiaries 6.00%