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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Current:      
Federal $ 0.0 $ 0.0 $ 0.0
State 0.7 0.8 0.8
Foreign 1.7 1.9 0.0
Current income tax expense 2.4 2.7 0.8
Deferred:      
Federal (1.9) 0.0 0.0
State (0.6) 0.0 0.0
Foreign 0.0 0.7 (1.0)
Deferred income tax expense (2.5) 0.7 (1.0)
Total $ (0.1) $ 3.4 $ (0.2)