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Debt - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Apr. 14, 2023
USD ($)
Debt Instrument [Line Items]          
Interest costs $ 13.3 $ 13.3 $ 26.5 $ 26.1  
Interest costs, capitalized 0.3 $ 0.3 $ 0.8 $ 0.5  
Letter of Credit          
Debt Instrument [Line Items]          
Commitment fee rate     0.25%    
Letter of credit fees     1.75%    
Letter of Credit | London Interbank Offered Rate          
Debt Instrument [Line Items]          
Interest rate margin     1.75%    
Letter of Credit | Base Rate          
Debt Instrument [Line Items]          
Interest rate margin     0.75%    
Maximum | Letter of Credit          
Debt Instrument [Line Items]          
Commitment fee rate     0.375%    
Letter of credit fees     2.50%    
Maximum | Letter of Credit | London Interbank Offered Rate          
Debt Instrument [Line Items]          
Interest rate margin     2.50%    
Maximum | Letter of Credit | Base Rate          
Debt Instrument [Line Items]          
Interest rate margin     1.50%    
Minimum | Letter of Credit          
Debt Instrument [Line Items]          
Commitment fee rate     0.25%    
Letter of credit fees     1.75%    
Minimum | Letter of Credit | London Interbank Offered Rate          
Debt Instrument [Line Items]          
Interest rate margin     1.75%    
Minimum | Letter of Credit | Base Rate          
Debt Instrument [Line Items]          
Interest rate margin     0.75%    
Line of Credit          
Debt Instrument [Line Items]          
Credit Agreement available for future borrowings 334.4   $ 334.4    
Short-term credit agreement borrowings $ 13.9   $ 13.9    
Borrowing rate 7.10%   7.10%    
Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Current borrowing capacity         $ 350.0
Required interest coverage ratio one         3.00
Required consolidated net leverage ratio         4.00
Revolving Credit Facility | Line of Credit | Maximum          
Debt Instrument [Line Items]          
Credit Agreement available for future borrowings         $ 300.0
Revolving Credit Facility | Line of Credit | Minimum          
Debt Instrument [Line Items]          
Credit Agreement available for future borrowings         $ 40.0
Letter of Credit | Line of Credit          
Debt Instrument [Line Items]          
Letters of credit issued $ 1.7   $ 1.7