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Supplemental Balance Sheet Information (Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023
Statement of Financial Position [Abstract]
Goodwill, Gross		$ 817.8
Goodwill, Impaired, Accumulated Impairment Loss		(724.1)
Goodwill	$ 95.5	$ 93.7
Goodwill, Foreign Currency Translation Gain (Loss)	$ 1.8

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