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Allowance for Doubtful Accounts (Tables)
 3 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Financing Receivable, Allowance for Credit Loss
Activity in the allowance for doubtful accounts for the three months ended December 31, 2020 was as follows:
(in millions)2021
Balance as of September 30, 2020$27.1 
ASU 2016-13 cumulative transition adjustment8.2 
Adjusted balance as of September 30, 202035.3 
Provision for bad debts1.5 
Allowance charge-offs— 
Balance as of December 31, 2020$36.8