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Revenue from Contracts with Customers (Tables)
6 Months Ended
Mar. 31, 2021
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 revenues.
March 31,September 30,
20212020
(in millions)
Billed receivables$184.5 $180.2 
Unbilled receivables4.2 4.6 
Total customer receivables$188.7 $184.8 
Deferred revenues$4.1 $5.6