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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance at beginning of year $ 6,211.4 $ 6,003.8
Acquisitions 0.0 189.8
Purchase price allocation adjustment 0.0 4.7
Foreign exchange revaluation (5.4) 13.1
Balance at End of Year $ 6,206.0 $ 6,211.4