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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
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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 |  |  |  |

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