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Revenue from Contracts with Customers (Tables)
3 Months Ended
Dec. 31, 2021
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 revenues.
December 31,September 30,
20212021
(in millions)
Billed receivables$181.8 $213.4 
Unbilled receivables2.7 2.3 
Gross customer receivables184.5 215.7 
Allowance for credit losses(4.1)(3.5)
Receivables, net$180.4 $212.2 
Deferred revenues$7.4 $5.4