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Restructuring (Tables)
6 Months Ended
Mar. 31, 2021
Restructuring [Abstract]  
Restructuring charges and related liabilities
Balance, September 30, 2020$— 
Charge to expense4.8 
Cash payments(3.7)
Non-cash charges— 
Balance, March 31, 2021$1.1 
Total expected restructuring charges$4.9 
Cumulative restructuring charges incurred to date4.8 
Remaining expected restructuring charges$0.1