Intangible Assets Level 4 - Finite-Lived Intangible Assets Future Amortization Expense (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011
Intangible Assets [Abstract]
Amortization of Intangible Assets	$ 1.8	$ 1.8
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	0.7
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2.1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	0.9
Finite-Lived Intangible Assets, Amortization Expense, Year Four	0.7
Finite-Lived Intangible Assets, Amortization Expense, Year Five	0.4
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	5.6
Finite-Lived Intangible Assets, Net	$ 10.4		$ 11.5