Intangible Assets Level 4 - Gross and Net Intangible Assets by Major Class (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 16.0	$ 15.3
Finite-Lived Intangible Assets, Accumulated Amortization	(5.6)	(3.8)
Finite-Lived Intangible Assets, Net	10.4	11.5
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Noncompete Agreements, Gross	3.7	3.7
Finite-Lived Intangible Assets, Accumulated Amortization	(2.6)	(1.7)
Finite-Lived Intangible Assets, Net	1.1	2.0
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Trade Names, Gross	0.6	0.6
Finite-Lived Intangible Assets, Accumulated Amortization	(0.5)	(0.5)
Finite-Lived Intangible Assets, Net	0.1	0.1
Computer Software, Intangible Asset [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Computer Software, Gross	2.1	2.1
Finite-Lived Intangible Assets, Accumulated Amortization	(1.1)	(0.6)
Finite-Lived Intangible Assets, Net	1.0	1.5
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Customer Lists, Gross	9.6	8.9
Finite-Lived Intangible Assets, Accumulated Amortization	(1.4)	(1.0)
Finite-Lived Intangible Assets, Net	$ 8.2	$ 7.9