SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Allowance for doubtful accounts receivable
Valuation accounts activity
Balance at Beginning of Period	$ 4.0	$ 3.1	$ 3.3
Charged to Costs & Expenses	4.0	1.0	(0.4)
Charged to Other Accounts	(0.1)	(0.1)	0.2
Deductions	0.0	0.0	0.0
Balance at End  of Period	7.9	4.0	3.1
Deferred tax valuation allowance
Valuation accounts activity
Balance at Beginning of Period	2.4	13.6	21.3
Charged to Costs & Expenses	0.2	(11.2)	(7.7)
Charged to Other Accounts	0.0	0.0	0.0
Deductions	0.0	0.0	0.0
Balance at End  of Period	$ 2.6	$ 2.4	$ 13.6