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Intangible Assets - Summary of Goodwill by Segment (Details) $ in Millions	6 Months Ended
	Mar. 31, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 658.0
Acquisitions	527.8
Dispositions	(3.4)
Goodwill, ending balance	1,182.4
Goodwill, measurement period adjustments	$ (3.4)

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