Quarterly report pursuant to Section 13 or 15(d)

Credit facilities and commercial paper notes - Additional Information (Details)

v3.22.1
Credit facilities and commercial paper notes - Additional Information (Details)
 1 Months Ended 3 Months Ended
Feb. 28, 2022
USD ($)
Sep. 30, 2021
USD ($)
Apr. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
facility
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Feb. 28, 2021
USD ($)
Line of Credit Facility [Line Items]              
Unamortized debt issuance costs       $ 10,000,000   $ 10,000,000  
Proceeds from issuance of commercial paper notes       $ 25,000,000 $ 0    
Credit facilities              
Line of Credit Facility [Line Items]              
Number of revolving credit facilities | facility       2      
Unamortized issuance costs       $ 2,000,000      
Default underlying financings (as a percent, more than)       50.00%      
Credit facilities | LIBOR              
Line of Credit Facility [Line Items]              
Default interest rate (as a percent)       2.00%      
Credit facilities | Rep-Based Facility              
Line of Credit Facility [Line Items]              
Principal amount         100,000,000   $ 250,000,000
Loss on modification         $ 1,500,000    
Availability fee (as a percent)       0.60%      
Credit facilities | Rep-Based Facility | U.S. federal government              
Line of Credit Facility [Line Items]              
Applicable valuation (as a percent)       85.00%      
Credit facilities | Rep-Based Facility | Institutional              
Line of Credit Facility [Line Items]              
Applicable valuation (as a percent)       80.00%      
Credit facilities | Rep-Based Facility | LIBOR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent)       1.40%      
Interest rate (as a percent)       1.85%      
Credit facilities | Rep-Based Facility | Federal Funds Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent)       0.40%      
Interest rate (as a percent)       0.85%      
Credit facilities | Approval-Based Facility              
Line of Credit Facility [Line Items]              
Principal amount       $ 200,000,000      
Credit facilities | Approval-Based Facility | Certain approved existing financing              
Line of Credit Facility [Line Items]              
Applicable valuation (as a percent)       85.00%      
Credit facilities | Approval-Based Facility | Others as prescribed by administrative agent              
Line of Credit Facility [Line Items]              
Applicable valuation (as a percent)       67.00%      
Credit facilities | Approval-Based Facility | LIBOR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent)       1.50%      
Interest rate (as a percent)       2.00%      
Credit facilities | Approval-Based Facility | Federal Funds Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent)       0.50%      
Interest rate (as a percent)       1.00%      
Credit facilities | New Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Principal amount $ 600,000,000            
Term loan fee (as a percent) 1.875%            
Credit facilities | New Revolving Credit Facility | SOFR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent)     1.875%        
Variable rate, maximum downward adjustment (as a percent) 0.10%            
Credit facilities | New Revolving Credit Facility | Prime Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent)     0.875%        
Credit facilities | Existing Unsecured Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Principal amount     $ 400,000,000        
Outstanding credit facility       $ 50,000,000      
Line of credit facility, interest rate during period (as a percent)       2.169%      
Unamortized debt issuance costs       $ 4,000,000      
Credit facilities | CarbonCount Green Commercial Paper Note Program              
Line of Credit Facility [Line Items]              
Line of credit facility, interest rate during period (as a percent)       1.46%      
Letter of Credit              
Line of Credit Facility [Line Items]              
Principal amount   $ 100,000,000          
Letter of Credit | CarbonCount Green Commercial Paper Note Program              
Line of Credit Facility [Line Items]              
Percentage of drawn letter of credit (as a percent)   0.0095          
Unused letter of credit capacity (as a percent)   0.40%          
Reduced percentage of letter of credit fee (as a percent)   0.0005          
Commercial Paper              
Line of Credit Facility [Line Items]              
Principal amount   $ 100,000,000          
Credit facility remaining no of days (in days)   397 days          
Commercial Paper | CarbonCount Green Commercial Paper Note Program              
Line of Credit Facility [Line Items]              
Proceeds from issuance of commercial paper notes       $ 75,000,000      
Broker fee percent (as a percent)   0.0010          
Unamortized financing costs       $ 1,000,000