Commitments and Contingencies - Contingencies and Litigation (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2014
Reinsurance Retention Policy, Excess Retention, Amount Reinsured	$ 0.5
Excess segregated funds returned	15.5
Excess segregated funds invested	21.9
Pre and Post Transfers of Funds related to Sentinel	15.5
Customer Segregated Transfers of Funds Pursuant to Safe Harbor	1.1
Sentinel Appeal Cash Deposit	8.0
Minimum [Member]
Excess segregated funds returned	4.0
Maximum [Member]
Excess segregated funds returned	$ 6.0