Contingencies and Commitments (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Purchase agreements
Increase (decrease) made by the company in the liabilities of environmental remediation costs	$ 0.1	$ 0.8
Environmental remediation liability	17.4	$ 17.3
Aggregate purchase commitments, due in 2026	213.8
Aggregate purchase commitments, due in 2027	60.6
Aggregate purchase commitments, due in 2028	3.8
Aggregate purchase commitments, due in 2029	1.1
Aggregate purchase commitments, due in 2030	0.6
Raw materials
Purchase agreements
Aggregate purchase commitments	$ 279.9

Undiscounted amount of the accrual for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.Y.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481931/410-30-50-7

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Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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