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Revenue from Contracts with Customers Components of Trade Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
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,
 
2019
 
2018
 
(in millions)
Billed receivables
$
171.0

 
$
165.3

Unbilled receivables
4.5

 
2.4

     Total customer receivables, gross
$
175.5

 
$
167.7

 
 
 
 
Deferred revenues
$
4.7

 
$
3.3


 
Billed receivables $ 171.0 $ 165.3
Unbilled receivables 4.5 2.4
Total customer receivables 175.5 167.7
Deferred revenues $ 4.7 $ 3.3