Commitments and Contingencies - Operating Leases (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Operating Leases [Abstract]
Operating Leases, Rent Expense	$ 9.5	$ 9.2	$ 8.9
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	8.2
Operating Leases, Future Minimum Payments, Due in Two Years	7.0
Operating Leases, Future Minimum Payments, Due in Three Years	6.0
Operating Leases, Future Minimum Payments, Due in Four Years	5.2
Operating Leases, Future Minimum Payments, Due in Five Years	5.1
Operating Leases, Future Minimum Payments, Due Thereafter	12.5
Operating Leases, Future Minimum Payments Due	$ 44.0