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Borrowings (Interest Expense Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 2.9	$ 1.4	$ 1.4
South Africa [Member] | Short-term Debt [Member]
Debt Instrument [Line Items]
Interest expense incurred	4.2	4.1
South Africa [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Interest expense incurred	16.9	16.1	13.1
Prepaid credit facility fees	$ 0.4	$ 0.4	$ 0.8

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