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Revenue from Contracts with Customers (Tables)
6 Months Ended
Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable e table below represents the balances of our customer receivables and deferred revenue.
March 31,September 30,
20222021
(in millions)
Billed receivables$224.8 $213.4 
Unbilled receivables1.9 2.3 
Gross customer receivables226.7 215.7 
Allowance for credit losses(4.5)(3.5)
Receivables, net$222.2 $212.2 
Deferred revenue$7.6 $5.4