Restructuring and Asset Impairment Charges - Activity and Reserve Balance Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Sep. 30, 2025	Jun. 30, 2024	Jun. 30, 2025
Restructuring Reserve [Roll Forward]
Reserve balance at beginning of fiscal year	$ 0.0		$ 1.1
Restructuring charges excluding noncash impairments	0.0	$ 1.1	1.1
Cash payments	0.0		(2.2)
Reserve balance at end of period	$ 0.0	$ 1.1	$ 0.0

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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Balance Type:	debit
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
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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.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 420
-SubTopic 10
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-Section S99
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