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Long-term debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 19, 2024
Jun. 20, 2024
Apr. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 28, 2024
Mar. 27, 2024
Jan. 30, 2024
Jan. 29, 2024
Jan. 12, 2024
Jan. 08, 2024
Dec. 31, 2023
Debt Instrument [Line Items]                            
Short-term debt       $ 864,197,000   $ 864,197,000                
Revolving and term credit facilities       4,589,200,000   4,589,200,000               $ 4,562,000,000
Repayment of third-party construction loan       1,250,081,000 $ 194,403,000 2,751,033,000 $ 398,179,000              
Interest on long-term debt       99,851,000   99,851,000               $ 74,493,000
Shady Oaks II Wind Facility | Subsequent Event                            
Debt Instrument [Line Items]                            
Repayment of third-party construction loan $ 163,735,000                          
Ownership interest acquired (percent) 50.00%                          
Senior unsecured revolving credit facilities                            
Debt Instrument [Line Items]                            
Line of credit increase (decrease), net                     $ 25,000,000      
Line of credit facility, maximum borrowing capacity                     $ 100,000,000      
Senior unsecured revolving credit facilities | Bermuda Working Capital Facility                            
Debt Instrument [Line Items]                            
Revolving and term credit facilities       $ 25,000,000   $ 25,000,000                
Senior unsecured bank credit facilities and delayed draw term facility                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity                         $ 306,500,000  
Debt prepaid   $ 306,500,000                        
Senior unsecured notes (Green Equity Units)                            
Debt Instrument [Line Items]                            
Face value               $ 1,150,000,000            
Interest rate               5.365% 1.18%          
Senior unsecured notes (Green Equity Units) | Senior Notes Due on January 31,2029                            
Debt Instrument [Line Items]                            
Interest rate                       5.577%    
Senior unsecured notes (Green Equity Units) | Senior Notes Due on January 31, 2034                            
Debt Instrument [Line Items]                            
Interest rate                       5.869%    
Senior unsecured notes (Green Equity Units) | Due On 2029 Notes                            
Debt Instrument [Line Items]                            
Interest rate                       99.996%    
Senior unsecured notes (Green Equity Units) | Due On 2034 Notes                            
Debt Instrument [Line Items]                            
Interest rate                       99.995%    
Senior Unsecured Notes                            
Debt Instrument [Line Items]                            
Debt prepaid     $ 70,000,000                      
Senior Unsecured Notes | Senior Notes Due on January 31,2029                            
Debt Instrument [Line Items]                            
Face value                       $ 500,000,000    
Senior Unsecured Notes | Senior Notes Due on January 31, 2034                            
Debt Instrument [Line Items]                            
Face value                       $ 350,000,000    
Senior secured utility bonds | Securitized Utility Tariff Bonds Due On January 2035                            
Debt Instrument [Line Items]                            
Face value                   $ 180,500,000        
Interest rate                   4.943%        
Senior secured utility bonds | Securitized Utility Tariff Bonds Due On January 2039                            
Debt Instrument [Line Items]                            
Face value                   $ 125,000,000        
Interest rate                   5.091%