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Intangible Assets - Finite-Lived Intangible Assets Future Amortization Expense (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Fiscal 2019 (remaining six months) $ 1.3  
Fiscal 2020 2.2  
Fiscal 2021 2.2  
Fiscal 2022 1.0  
Fiscal 2023 and thereafter 3.4  
Finite-Lived Intangible Assets, Net $ 10.1 $ 11.4