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Cloud Computing Arrangements - Schedule of Capitalized Computer Software, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Short-term portion $ 10.4 $ 10.2
Long-term portion 61.2 60.6
Total Capitalized implementation costs 71.6 70.8
Less: accumulated amortization (14.2) (6.3)
Total Capitalized implementation costs, net $ 57.4 $ 64.5