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Long-term Debt - Senior Unsecured Credit Facility (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
May 12, 2022
Dec. 31, 2021
Long-term debt            
Letters of credit outstanding, amount $ 400,000   $ 400,000      
Available borrowing capacity 1,355,600,000   1,355,600,000      
Losses on debt extinguishment 2,189,000 $ 0 2,189,000 $ 0    
Senior unsecured credit facility            
Long-term debt            
Long-term debt, gross 394,000,000   $ 394,000,000      
Senior unsecured credit facility | Base Rate            
Long-term debt            
Debt instrument, basis spread on variable rate     0.05%      
Senior unsecured credit facility | Secured Overnight Financing Rate (SOFR)            
Long-term debt            
Debt instrument, basis spread on variable rate     105.00%      
Senior unsecured credit facility | Minimum | Base Rate            
Long-term debt            
Debt instrument, basis spread on variable rate     0.00%      
Senior unsecured credit facility | Minimum | Secured Overnight Financing Rate (SOFR)            
Long-term debt            
Debt instrument, basis spread on variable rate     0.725%      
Senior unsecured credit facility | Maximum | Base Rate            
Long-term debt            
Debt instrument, basis spread on variable rate     0.40%      
Senior unsecured credit facility | Maximum | Secured Overnight Financing Rate (SOFR)            
Long-term debt            
Debt instrument, basis spread on variable rate     1.40%      
Unsecured $1,175 million revolver            
Long-term debt            
Line of Credit Facility, Commitment Fee Percentage     25.00%      
Unsecured $1,175 million revolver | Minimum            
Long-term debt            
Line of Credit Facility, Commitment Fee Percentage     0.125%      
Unsecured $1,175 million revolver | Maximum            
Long-term debt            
Line of Credit Facility, Commitment Fee Percentage     30.00%      
Unsecured $1,175 million revolver            
Long-term debt            
Line of credit facility, maximum borrowing capacity $ 1,750,000,000   $ 1,750,000,000   $ 1,175,000,000 $ 1,750,000,000