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Revenue from Contracts with Customers Components of Trade Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
The table below represents the balances of our customer receivables and deferred revenues.
 September 30,
 20222021
 (in millions)
Billed receivables$230.5 $213.4 
Unbilled receivables3.1 2.3 
     Gross customer receivables$233.6 $215.7 
Allowance for credit losses(5.6)(3.5)
     Receivables, net$228.0 $212.2 
Deferred revenues$8.1 $5.4 
 
Billed receivables $ 230.5 $ 213.4
Unbilled receivables 3.1 2.3
Total customer receivables 233.6 215.7
Deferred revenues $ 8.1 $ 5.4