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Revenue from Contracts with Customers Components of Trade Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
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,
 20202019
 (in millions)
Billed receivables$180.2 $171.0 
Unbilled receivables4.6 4.5 
     Total customer receivables, gross$184.8 $175.5 
Deferred revenues$5.6 $4.7 
 
Billed receivables $ 180.2 $ 171.0
Unbilled receivables 4.6 4.5
Total customer receivables 184.8 175.5
Deferred revenues $ 5.6 $ 4.7