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Restructuring (Tables)
12 Months Ended
Sep. 30, 2021
Restructuring [Abstract]  
Restructuring charges and related liabilities
Balance, September 30, 2020$— 
Charge to expense4.7 
Cash payments(4.7)
Non-cash charges— 
Balance, September 30, 2021$— 
Total expected restructuring charges$4.7 
Cumulative restructuring charges incurred to date4.7 
Remaining expected restructuring charges$—