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Restructuring - Schedule of Restructuring Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Cash restructuring charges      
Severance and other personnel costs $ 5.1 $ 23.4 $ 36.5
Exit and disposal costs and professional fees 11.9 9.6 19.2
Total cash restructuring charges 17.0 33.0 55.7
Non-cash charges      
Asset write-downs and write-offs 11.6 21.1 40.8
Stock-based compensation expense 0.8 0.8 6.6
Write-offs of inventory related to restructuring activities 0.0 0.0 1.0
Loss on sale of subsidiary 0.0 0.0 3.8
Total non-cash restructuring charges 12.4 21.9 52.2
Total $ 29.5 54.9 107.9
2024 Restructuring Plan      
Cash restructuring charges      
Severance and other personnel costs   0.1 29.0
Exit and disposal costs and professional fees   3.1  
Non-cash charges      
Asset write-downs and write-offs   9.7  
Stock-based compensation expense   (0.6)  
2025 Restructuring Plan      
Cash restructuring charges      
Severance and other personnel costs   23.2  
2022 Restructuring Plan      
Cash restructuring charges      
Severance and other personnel costs     $ 7.5
Exit and disposal costs and professional fees   16.1  
Non-cash charges      
Asset write-downs and write-offs   31.1  
Stock-based compensation expense   $ 7.2