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Debt - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jul. 10, 2020
Jun. 30, 2020
Debt Instrument [Line Items]            
Interest costs $ 10,900,000 $ 7,500,000 $ 20,300,000 $ 14,900,000    
Interest costs, capitalized 3,000,000.0 2,200,000 5,700,000 4,200,000    
Debt extinguishment losses, net $ 0 $ 0 8,200,000 $ 0    
Interest Rate Swaps            
Debt Instrument [Line Items]            
Derivative, gain on derivative     $ 2,300,000      
Credit Agreement            
Debt Instrument [Line Items]            
Borrowing rate 1.65%   1.65%      
Senior unsecured notes, 6.375% due July 2028            
Debt Instrument [Line Items]            
Face amount $ 400,000,000.0   $ 400,000,000.0   $ 400,000,000  
Interest rate 6.375%   6.375%      
Senior unsecured notes, 5.20% due July 2021            
Debt Instrument [Line Items]            
Face amount         $ 250,000,000.0 $ 250,000,000.0
Interest rate           5.20%
Debt extinguishment losses, net     $ 10,500,000      
Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 400,000,000.0   400,000,000.0      
Letters of credit issued 6,000,000.0   6,000,000.0      
Credit Agreement available for future borrowings $ 394,000,000.0   $ 394,000,000.0      
Credit Agreement | LIBOR            
Debt Instrument [Line Items]            
Interest rate margin     1.25%      
Credit Agreement | LIBOR | Minimum            
Debt Instrument [Line Items]            
Interest rate margin     1.00%      
Credit Agreement | LIBOR | Maximum            
Debt Instrument [Line Items]            
Interest rate margin     1.75%      
Credit Agreement | Base Rate            
Debt Instrument [Line Items]            
Interest rate margin     0.25%      
Credit Agreement | Base Rate | Minimum            
Debt Instrument [Line Items]            
Interest rate margin     0.00%      
Credit Agreement | Base Rate | Maximum            
Debt Instrument [Line Items]            
Interest rate margin     0.75%      
Letters of credit            
Debt Instrument [Line Items]            
Commitment fee rate     0.20%      
Letter of credit fees     1.50%      
Required interest coverage ratio     3.50      
Letters of credit | Minimum            
Debt Instrument [Line Items]            
Commitment fee rate     0.125%      
Letter of credit fees     1.00%      
Letters of credit | Maximum            
Debt Instrument [Line Items]            
Commitment fee rate     0.40%      
Letter of credit fees     1.75%      
Required debt to capital ratio (less than) 0.55   0.55