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Supplemental Statement of Operations Information - Restructuring Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 3.4	$ 6.6	$ 3.3
Restructuring Charges	8.8	15.8	10.2
Payments for Restructuring	(11.1)	(19.0)	(6.9)
Restructuring Reserve, Ending Balance	$ 1.1	$ 3.4	$ 6.6

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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