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Revenue from Contracts with Customers Components of Trade Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
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,
 20212020
 (in millions)
Billed receivables$217.0 $180.3 
Unbilled receivables2.3 5.3 
     Total customer receivables, gross$219.3 $185.6 
Deferred revenues$5.4 $5.6 
 
Billed receivables $ 217.0 $ 180.3
Unbilled receivables 2.3 5.3
Total customer receivables 219.3 185.6
Deferred revenues $ 5.4 $ 5.6