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Revenue from Contracts with Customers (Tables)
3 Months Ended
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Financing Receivables, Minimum Payments [Table Text Block]
The table below represents the balances of our customer receivables and deferred revenues.
December 31,September 30,
20192019
(in millions)
Billed receivables$129.2  $171.0  
Unbilled receivables5.2  4.5  
Total customer receivables$134.4  $175.5  
Deferred revenues$4.4  $4.7