Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 14.6	$ 19.0
Finite-Lived Intangible Assets, Accumulated Amortization	(4.7)	(8.5)
Finite-Lived Intangible Assets, Net	9.9	10.5
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Noncompete Agreements, Gross	0	3.7
Finite-Lived Intangible Assets, Accumulated Amortization	0	(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	0.7
Finite-Lived Intangible Assets, Accumulated Amortization	0	(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	(1.7)	(1.5)
Finite-Lived Intangible Assets, Net	0.5	0.7
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Customer Lists, Gross	12.4	12.4
Finite-Lived Intangible Assets, Accumulated Amortization	(3.0)	(2.6)
Finite-Lived Intangible Assets, Net	$ 9.4	$ 9.8