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Restructuring (Tables)
3 Months Ended
Dec. 31, 2020
Restructuring [Abstract]  
Restructuring charges and related liabilities
Balance, September 30, 2020$— 
Charge to expense4.5 
Cash payments(0.4)
Non-cash charges— 
Balance, December 31, 2020$4.1 
Total expected restructuring charges$4.7 
Cumulative restructuring charges incurred to date4.5 
Remaining expected restructuring charges$0.2