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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Summary of Significant Accounting Policies    
Restricted Cash $ 0.9 $ 0.8
Restricted Cash, Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent Other Assets, Noncurrent