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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Roll Forward]
Goodwill, Beginning balance	$ 821.1	$ 817.8
Accumulated impairment	(740.4)	(740.4)	$ (724.1)
Net goodwill	89.2	80.7	93.7
Change in foreign currency exchange rates	8.5	3.3
Goodwill impairment	0.0	(16.3)	0.0
Goodwill, Ending balance	$ 829.6	$ 821.1	$ 817.8

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