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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Sep. 30, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 17.8 $ 16.7
Finite-Lived Intangible Assets, Accumulated Amortization (8.3) (7.2)
Finite-Lived Intangible Assets, Net 9.5 9.5
Trade Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Trade Names, Gross 1.1 0.0
Finite-Lived Intangible Assets, Accumulated Amortization (0.3) 0.0
Finite-Lived Intangible Assets, Net 0.8 0.0
Computer Software, Intangible Asset [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Computer Software, Gross 2.7 2.7
Finite-Lived Intangible Assets, Accumulated Amortization (2.4) (2.3)
Finite-Lived Intangible Assets, Net 0.3 0.4
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Customer Lists, Gross 14.0 14.0
Finite-Lived Intangible Assets, Accumulated Amortization (5.6) (4.9)
Finite-Lived Intangible Assets, Net $ 8.4 $ 9.1