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Goodwill and Other Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 6,206.0	$ 6,211.4	$ 6,003.8
Indefinite-lived intangible assets	3,400.3	3,851.5
Definite-lived intangible assets, net	765.7	950.6
Goodwill and Other Intangible Assets, Net	$ 10,372.0	$ 11,013.5

X

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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