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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Computer Software, Gross $ 30.5 $ 25.3
Finite-Lived Intangible Assets, Gross 24.1 22.7
Finite-Lived Intangible Assets, Accumulated Amortization (12.7) (10.4)
Finite-Lived Intangible Assets, Net 11.4 12.3
Trade Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Trade Names, Gross 0.0 0.0
Finite-Lived Intangible Assets, Accumulated Amortization 0.0 0.0
Finite-Lived Intangible Assets, Net 0.0 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 (2.6) (2.5)
Finite-Lived Intangible Assets, Net 0.1 0.2
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Customer Lists, Gross 21.4 20.0
Finite-Lived Intangible Assets, Accumulated Amortization (10.1) (7.9)
Finite-Lived Intangible Assets, Net $ 11.3 $ 12.1