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Debt - Narrative (Details)
$ in Millions
12 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Apr. 14, 2023
USD ($)
Long-term debt outstanding        
Aggregate maturities of long-term debt, 2026 $ 0.0      
Aggregate maturities of long-term debt, 2027 0.0      
Aggregate maturities of long-term debt, 2028 0.0      
Aggregate maturities of long-term debt, 2029 400.0      
Aggregate maturities of long-term debt, 2030 300.0 $ 300.0    
Interest costs 51.0 52.6 $ 55.6  
Interest costs, capitalized $ 2.6 $ 1.6 $ 1.5  
Letter of Credit        
Long-term debt outstanding        
Commitment fee rate 0.25%      
Letter of credit fees 1.75%      
Minimum | Letter of Credit        
Long-term debt outstanding        
Commitment fee rate 0.25%      
Letter of credit fees 1.75%      
Maximum | Letter of Credit        
Long-term debt outstanding        
Commitment fee rate 0.375%      
Letter of credit fees 2.50%      
Secured Overnight Financing Rate (SOFR) | Letter of Credit        
Long-term debt outstanding        
Interest rate margin 1.75%      
Secured Overnight Financing Rate (SOFR) | Minimum | Letter of Credit        
Long-term debt outstanding        
Interest rate margin 1.75%      
Secured Overnight Financing Rate (SOFR) | Maximum | Letter of Credit        
Long-term debt outstanding        
Interest rate margin 2.50%      
Base Rate | Letter of Credit        
Long-term debt outstanding        
Interest rate margin 0.75%      
Base Rate | Minimum | Letter of Credit        
Long-term debt outstanding        
Interest rate margin 0.75%      
Base Rate | Maximum | Letter of Credit        
Long-term debt outstanding        
Interest rate margin 1.50%      
Credit Agreement        
Long-term debt outstanding        
Credit Agreement available for future borrowings $ 348.9      
Short-term credit agreement borrowings $ 0.0      
Borrowing rate 6.18%      
Credit Agreement | Revolving Credit Facility        
Long-term debt outstanding        
Current borrowing capacity       $ 350.0
Required interest coverage ratio one       3.00
Required consolidated net leverage ratio       4.00
Credit Agreement | Revolving Credit Facility | Minimum        
Long-term debt outstanding        
Credit Agreement available for future borrowings       $ 40.0
Credit Agreement | Revolving Credit Facility | Maximum        
Long-term debt outstanding        
Credit Agreement available for future borrowings       $ 300.0
Credit Agreement | Letter of Credit        
Long-term debt outstanding        
Letters of credit issued $ 1.1