Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Contractholder Funds and Furutre Policy Benefits (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Reserves for funding agreements, total	$ 554.9	$ 364.1
Fair value of callateral investments	$ 604.9	$ 390.6