v3.26.1
Contingencies and Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Purchase agreements    
Increase (decrease) made by the company in the liabilities of environmental remediation costs $ (0.1) $ 0.1
Environmental remediation liability 17.3 $ 17.4
Aggregate purchase commitments, due in 2027 278.4  
Aggregate purchase commitments, due in 2028 32.8  
Aggregate purchase commitments, due in 2029 2.6  
Aggregate purchase commitments, due in 2030 0.9  
Aggregate purchase commitments, due in 2031 0.0  
Raw materials    
Purchase agreements    
Aggregate purchase commitments $ 314.7