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Supplemental Balance Sheet Information (Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2025	Sep. 30, 2024
Statement of Financial Position [Abstract]
Goodwill, Gross		$ 821.1
Goodwill, Impaired, Accumulated Impairment Loss		(740.4)
Goodwill	$ 87.6	$ 80.7
Goodwill, Foreign Currency Translation, Gain (Loss)	$ 6.9

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