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Supplemental Balance Sheet Information (Goodwill) (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2025	Sep. 30, 2024
Statement of Financial Position [Abstract]
Goodwill, Gross		$ 821.1
Goodwill, Impaired, Accumulated Impairment Loss		(740.4)
Goodwill	$ 80.9	$ 80.7
Goodwill, Foreign Currency Translation Gain (Loss)	$ 0.2

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