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Debt - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Rate
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Apr. 30, 2022
USD ($)
Mar. 16, 2022
USD ($)
Mar. 26, 2021
USD ($)
Jul. 10, 2020
USD ($)
Long-term debt outstanding                    
Aggregate maturities of long-term debt, 2023     $ 0 $ 0            
Aggregate maturities of long-term debt, 2024     0 0            
Aggregate maturities of long-term debt, 2025     0 0            
Aggregate maturities of long-term debt, 2026     0 0            
Aggregate maturities of long-term debt, 2027     0 0            
Interest costs       45,700,000 $ 40,800,000 $ 28,800,000        
Interest costs, capitalized       800,000 8,100,000 9,000,000        
Debt extinguishment losses, net       (6,000,000.0) (8,200,000) $ 0        
Forward interest rate swaps                    
Long-term debt outstanding                    
Derivative, gain on derivative         2,300,000          
Senior unsecured notes, 7.625% due March 2030 (face value of $300.0 million at June 30, 2022)                    
Long-term debt outstanding                    
Face amount     $ 300,000,000.0 $ 300,000,000.0 $ 300,000,000.0     $ 300,000,000    
Interest rate     7.625% 7.625% 7.625%     7.625%    
Long-term debt     $ 295,900,000 $ 295,900,000 $ 0          
Senior Unsecured Notes 5.20 Percent Due July 2021                    
Long-term debt outstanding                    
Face amount                   $ 250,000,000
Debt extinguishment losses, net         $ 10,500,000          
Senior Unsecured Notes 4.45 Percent Due March 2023                    
Long-term debt outstanding                    
Face amount             $ 300,000,000      
Interest rate             4.45%   4.45%  
Long-term debt                 $ 300,000,000  
Letter of Credit                    
Long-term debt outstanding                    
Maximum borrowing capacity     300,000,000 $ 300,000,000            
Commitment fee rate       0.35%            
Letter of credit fees       2.00%            
Minimum | Letter of Credit                    
Long-term debt outstanding                    
Commitment fee rate       0.275%            
Letter of credit fees       1.25%            
Maximum | Letter of Credit                    
Long-term debt outstanding                    
Commitment fee rate       0.375%            
Letter of credit fees       2.25%            
LIBOR | Letter of Credit                    
Long-term debt outstanding                    
Interest rate margin       2.00%            
LIBOR | Minimum | Letter of Credit                    
Long-term debt outstanding                    
Interest rate margin       1.25%            
LIBOR | Maximum | Letter of Credit                    
Long-term debt outstanding                    
Interest rate margin       2.25%            
Base Rate | Letter of Credit                    
Long-term debt outstanding                    
Interest rate margin       1.00%            
Base Rate | Minimum | Letter of Credit                    
Long-term debt outstanding                    
Interest rate margin       0.25%            
Base Rate | Maximum | Letter of Credit                    
Long-term debt outstanding                    
Interest rate margin       1.25%            
Credit Agreement                    
Long-term debt outstanding                    
Maximum borrowing capacity                 300,000,000  
Short-term credit agreement borrowings     0 $ 0            
Credit Agreement available for future borrowings     $ 294,100,000 $ 294,100,000            
Borrowing rate     3.67% 3.67%            
Credit Agreement | Maximum                    
Long-term debt outstanding                    
Required debt to capital ratio     0.55 0.55            
Credit Agreement | Revolving Credit Facility                    
Long-term debt outstanding                    
Maximum borrowing capacity                 500,000,000  
Debt instrument, covenant, credit commitment amount                 300,000,000  
Required interest coverage ratio one     2.00 200.00%            
Required interest coverage ratio two | Rate       300.00%            
Asset coverage ratio | Rate       110.00%            
Credit Agreement | Revolving Credit Facility | Forecast                    
Long-term debt outstanding                    
Required interest coverage ratio two 3.00 3.50                
Credit Agreement | Letter of Credit                    
Long-term debt outstanding                    
Maximum borrowing capacity                 $ 40,000,000  
Letters of credit issued     $ 5,900,000 $ 5,900,000