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Debt - Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Mar. 26, 2021
Jul. 10, 2020
Long-term debt outstanding          
Aggregate maturities of long-term debt, 2022 $ 0.0        
Aggregate maturities of long-term debt, 2023 300,000,000.0        
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        
Interest costs 40,800,000 $ 28,800,000 $ 31,100,000    
Interest costs, capitalized 8,100,000 9,000,000.0 5,100,000    
Debt extinguishment losses, net (8,200,000) $ 0.0 $ 0    
Forward interest rate swaps          
Long-term debt outstanding          
Derivative, gain on derivative 2,300,000        
Senior unsecured notes, 5.20% due July 2021 (face value of $250.0 million at June 30, 2020)          
Long-term debt outstanding          
Face amount         $ 250,000,000.0
Debt extinguishment losses, net 10,500,000        
Senior Unsecured Notes 4.45 Percent Due March 2023          
Long-term debt outstanding          
Interest rate       4.45%  
Long-term debt       $ 300,000,000.0  
Letter of Credit          
Long-term debt outstanding          
Maximum borrowing capacity $ 300,000,000.0        
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       300,000,000.0  
Short-term credit agreement borrowings $ 0        
Credit Agreement available for future borrowings $ 294,600,000        
Borrowing rate 2.10%        
Credit Agreement | Maximum          
Long-term debt outstanding          
Required debt to capital ratio 0.55        
Credit Agreement | Revolving Credit Facility          
Long-term debt outstanding          
Maximum borrowing capacity       500,000,000.0  
Debt instrument, covenant, credit commitment amount       300,000,000.0  
Required interest coverage ratio one 300.00%        
Required interest coverage ratio two 350.00%        
Minimum available liquidity $ 150,000,000.0        
Asset coverage ratio 110.00%        
Credit Agreement | Letter of Credit          
Long-term debt outstanding          
Maximum borrowing capacity       $ 40,000,000.0  
Letters of credit issued $ 5,400,000