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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]      
Indefinite-Lived License Agreements $ 2.7 $ 2.7 $ 0.0
Finite-Lived Intangible Assets, Accumulated Amortization 0.0 (14.6) (12.7)
Finite-Lived Intangible Assets, Net 9.5 9.5 11.4
Finite-Lived Intangible Assets, Gross   24.1 24.1
Gross Finite and Indefinite-Lived Intangible Assets   26.8 24.1
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges (14.6)   (12.7)
Intangible Assets, Net (Excluding Goodwill) $ 12.2   11.4
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) (2.6)
Finite-Lived Intangible Assets, Net   0.1 0.1
Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Customer Lists, Gross   21.4 21.4
Finite-Lived Intangible Assets, Accumulated Amortization   (12.0) (10.1)
Finite-Lived Intangible Assets, Net   $ 9.4 $ 11.3