Business Restructuring Charges - Schedule of Restructuring Liability Activity (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2025	Jun. 30, 2025
Restructuring Reserve [Roll Forward]
Beginning balance		$ 0.0
Charged to expense	$ 1.0	37.8
Cash payments		(21.5)
Non-cash adjustments		(13.7)
Ending balance	2.6	2.6
Salaries, wages and related items
Restructuring Reserve [Roll Forward]
Ending balance	1.2	1.2
Accrued expenses
Restructuring Reserve [Roll Forward]
Ending balance	1.4	1.4
Employee Termination
Restructuring Reserve [Roll Forward]
Beginning balance		0.0
Charged to expense	0.1	21.8
Cash payments		(17.5)
Non-cash adjustments		(3.1)
Ending balance	1.2	1.2
Non-Employee Related
Restructuring Reserve [Roll Forward]
Beginning balance		0.0
Charged to expense	0.9	16.0
Cash payments		(4.0)
Non-cash adjustments		(10.6)
Ending balance	$ 1.4	$ 1.4

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.

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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.

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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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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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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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