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Supplemental Balance Sheet Information (Goodwill) (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022
Statement of Financial Position [Abstract]
Goodwill	$ 99.0	$ 98.6
Goodwill, Gross		822.7
Goodwill, Impaired, Accumulated Impairment Loss		$ (724.1)
Goodwill, Foreign Currency Translation Gain (Loss)	$ 0.4

X

- Definition

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.

+ References

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+ References

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