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Supplemental Balance Sheet Information (Goodwill) (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Sep. 30, 2023
Statement of Financial Position [Abstract]
Goodwill, Gross		$ 817.8
Goodwill, Impaired, Accumulated Impairment Loss		(724.1)
Goodwill	$ 97.0	$ 93.7
Goodwill, Foreign Currency Translation Gain (Loss)	$ 3.3

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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