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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Computer Software, Gross $ 33.9 $ 30.5
Finite-Lived Intangible Assets, Gross 27.4 24.1
Finite-Lived Intangible Assets, Accumulated Amortization 15.5 12.7
Intangible Assets, Net (Excluding Goodwill) 16.7 11.4
Finite-Lived Intangible Assets, Net 11.9 11.4
Indefinite-Lived License Agreements 2.1 0.0
Indefinite-lived Intangible Assets (Excluding Goodwill) 4.8 0.0
Intangible Assets, Gross (Excluding Goodwill) 32.2 24.1
Computer Software, Intangible Asset [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Computer Software, Gross 5.3 2.7
Finite-Lived Intangible Assets, Accumulated Amortization (3.0) (2.6)
Finite-Lived Intangible Assets, Net 2.3 0.1
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Customer Lists, Gross 22.1 21.4
Finite-Lived Intangible Assets, Accumulated Amortization (12.5) (10.1)
Finite-Lived Intangible Assets, Net 9.6 11.3
Licensing Agreements [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 2.7 $ 0.0