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Revenue from Contracts with Customers (Tables)
12 Months Ended
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable, Unclassified [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The table below represents the balances of our customer receivables and deferred revenue.
 September 30,
 20232022
 (in millions)
Billed receivables$218.1 $230.5 
Unbilled receivables6.3 3.1 
     Gross customer receivables224.4 233.6 
Allowance for credit losses(7.3)(5.6)
     Receivables, net$217.1 $228.0 
Deferred revenue
$9.2 $8.1