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Revenue from Contracts with Customers - Components of Trade Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable, Unclassified [Abstract]    
Billed receivables $ 212.7 $ 218.1
Unbilled receivables 4.5 6.3
Gross customer receivables 217.2 224.4
Allowance for credit losses (8.3) (7.3)
Receivables, net 208.9 217.1
Deferred revenue $ 12.8 $ 9.2