Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Trade Names, Gross	$ 0.1
Finite-Lived Intangible Assets, Gross	16.2	15.3
Finite-Lived Intangible Assets, Accumulated Amortization	(6.3)	(3.8)
Finite-Lived Intangible Assets, Net	9.9	11.5
Goodwill	43.6	42.5
Gross Finite and Indefinite-Lived Intangible Assets	17.4	17.4
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges	(6.3)	(3.8)
Intangible Assets, Net (Excluding Goodwill)	11.1	13.6
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	(3.0)	(1.7)
Finite-Lived Intangible Assets, Net	0.7	2.0
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Trade Names, Gross	0.7	0.6
Finite-Lived Intangible Assets, Accumulated Amortization	(0.5)	(0.5)
Finite-Lived Intangible Assets, Net	0.2	0.1
Computer Software, Intangible Asset [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Computer Software, Gross	2.2	2.1
Finite-Lived Intangible Assets, Accumulated Amortization	(1.0)	(0.6)
Finite-Lived Intangible Assets, Net	1.2	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	(1.8)	(1.0)
Finite-Lived Intangible Assets, Net	$ 7.8	$ 7.9