Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Narrative (Details)

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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Disaggregation of Revenue [Line Items]          
Deferred revenue, revenue recognized $ 13.9 $ 23.7 $ 75.3 $ 85.5  
Unbilled receivables          
Disaggregation of Revenue [Line Items]          
Unbilled contracts receivable $ 13.7   $ 13.7   $ 13.1