Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1.6
Finite-Lived Computer Software, Gross	9.0	$ 6.2
Finite-Lived Intangible Assets, Gross	16.7	15.1
Finite-Lived Intangible Assets, Accumulated Amortization	(7.2)	(5.7)
Finite-Lived Intangible Assets, Net	9.5	9.4
Gross Finite and Indefinite-Lived Intangible Assets	17.8	16.2
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges	(7.2)	(5.7)
Intangible Assets, Net (Excluding Goodwill)	10.6	10.5
Computer Software, Intangible Asset [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Computer Software, Gross	2.7	2.2
Finite-Lived Intangible Assets, Accumulated Amortization	(2.3)	(1.9)
Finite-Lived Intangible Assets, Net	0.4	0.3
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Customer Lists, Gross	14.0	12.9
Finite-Lived Intangible Assets, Accumulated Amortization	(4.9)	(3.8)
Finite-Lived Intangible Assets, Net	$ 9.1	$ 9.1