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Revenue from Contracts with Customers (Tables)
3 Months Ended
Dec. 31, 2020
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.
December 31,September 30,
20202020
(in millions)
Billed receivables$156.3 $180.2 
Unbilled receivables5.3 4.6 
Total customer receivables$161.6 $184.8 
Deferred revenues$5.1 $5.6