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Intangible Assets - Summary of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 615.3 $ 578.0
Acquisitions 55.6 44.3
Currency translation (1.5) (0.1)
Dispositions (11.4) (6.9)
Goodwill, ending balance $ 658.0 $ 615.3