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Supplemental Balance Sheet Information - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents - continuing operations	$ 51.6	$ 68.3	$ 409.1
Restricted cash	0.0	0.4	0.0
Total cash, cash equivalents and restricted cash	51.6	68.7	413.1	$ 83.9
Discontinued Operations, Held-for-sale
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 0.0	$ 0.0	$ 4.0

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; attributable to continuing operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.

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