Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Computer Software, Gross	$ 6.2	$ 6.0
Finite-Lived Intangible Assets, Gross	19.5	19.0
Finite-Lived Intangible Assets, Accumulated Amortization	(10.1)	(8.5)
Finite-Lived Intangible Assets, Net	9.4	10.5
Gross Finite and Indefinite-Lived Intangible Assets	20.6	20.1
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges	(10.1)	(8.5)
Intangible Assets, Net (Excluding Goodwill)	10.5	11.6
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	(3.7)	(3.7)
Finite-Lived Intangible Assets, Net	0	0
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Trade Names, Gross	0.7	0.7
Finite-Lived Intangible Assets, Accumulated Amortization	(0.7)	(0.7)
Finite-Lived Intangible Assets, Net	0	0
Computer Software, Intangible Asset [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Computer Software, Gross	2.2	2.2
Finite-Lived Intangible Assets, Accumulated Amortization	(1.9)	(1.5)
Finite-Lived Intangible Assets, Net	0.3	0.7
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Customer Lists, Gross	12.9	12.4
Finite-Lived Intangible Assets, Accumulated Amortization	(3.8)	(2.6)
Finite-Lived Intangible Assets, Net	$ 9.1	$ 9.8