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 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Disaggregation of Revenue [Line Items]          
Deferred revenue, revenue recognized $ 7.6 $ 34.8 $ 45.3 $ 85.9  
Unbilled receivables          
Disaggregation of Revenue [Line Items]          
Unbilled contracts receivable $ 24.1   $ 24.1   $ 20.7