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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Computer Software, Gross $ 25.3 $ 22.8
Finite-Lived Intangible Assets, Gross 22.7 17.8
Finite-Lived Intangible Assets, Accumulated Amortization (10.4) (8.7)
Finite-Lived Intangible Assets, Net 12.3 9.1
Trade Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Trade Names, Gross 0.0 1.1
Finite-Lived Intangible Assets, Accumulated Amortization 0.0 0.6
Finite-Lived Intangible Assets, Net 0.0 0.5
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 (2.5) (2.4)
Finite-Lived Intangible Assets, Net 0.2 0.3
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Customer Lists, Gross 20.0 14.0
Finite-Lived Intangible Assets, Accumulated Amortization (7.9) (5.7)
Finite-Lived Intangible Assets, Net $ 12.1 $ 8.3