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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The table below represents the balances of our customer receivables and deferred revenue:

June 30,September 30,
20252024
(in millions)
Billed receivables$205.3 $212.7 
Unbilled receivables5.4 4.5 
Gross customer receivables210.7 217.2 
Allowance for credit losses(5.3)(8.3)
Receivables, net$205.4 $208.9 
Deferred revenue$11.3 $12.8 
Accounts Receivable, Allowance for Credit Loss The table below represents the activity in the allowance:
Nine months ended
June 30,
20252024
(in millions)
Beginning balance$8.3 $7.3 
Provision (reversed) charged to expense(0.2)2.3 
Write-offs and other(2.8)(1.7)
Ending balance$5.3 $7.9 
Contract with Customer, Contract Asset, Contract Liability, and Receivable Activity in deferred revenue during the period is as follows:
Nine months ended
June 30,
20252024
(in millions)
Beginning balance$12.8 $9.2 
Revenue deferred during the period6.2 6.9 
Previously deferred revenue recognized during the period(7.7)(5.0)
Ending balance$11.3 $11.1