Annual report pursuant to Section 13 and 15(d)

Credit facilities and commercial paper notes (Details)

v3.25.0.1
Credit facilities and commercial paper notes (Details)
 1 Months Ended 12 Months Ended
Feb. 28, 2022
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Line of Credit Facility [Line Items]      
Commercial paper notes   $ 100,057,000 $ 30,196,000
Credit facilities   1,001,000 400,861,000
Credit Facilities | Unsecured Credit Facility      
Line of Credit Facility [Line Items]      
Maximum outstanding amount   1,350,000,000 $ 915,000,000
Outstanding credit facility   0  
Less: Unamortized financing costs   9,000,000  
Term loan fee (in percent) 1.625%    
Credit Facilities | Unsecured Credit Facility | SOFR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (in percent) 1.625%    
Credit Facilities | Unsecured Credit Facility | Prime Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (in percent) 0.625%    
Credit Facilities | New Revolving Credit Facility | Additional Variable Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (in percent) 0.10%    
Credit Facilities | Senior Secured Revolving Credit Agreement | Line of Credit      
Line of Credit Facility [Line Items]      
Maximum outstanding amount   100,000,000  
Less: Unamortized financing costs   $ 1,000,000  
Basis spread on variable rate (in percent)   1.90%  
Unused letter of credit capacity (in percent)   0.20%  
Pledged collateral   80.00%  
Targeted rate reduction   0.10%  
Credit facilities   $ 0  
Available borrowing   $ 22,000,000  
Line of Credit | Unsecured Credit Facility | Unsecured Debt | SOFR      
Line of Credit Facility [Line Items]      
Variable rate, maximum downward adjustment (in percent) 0.10% 0.10%  
Commercial Paper | Credit Enhanced Commercial Paper Note Program      
Line of Credit Facility [Line Items]      
Maximum outstanding amount   $ 125,000,000  
Grace period (in days)   5 days  
Credit facility remaining no of days (in days)   397 days  
Broker fee percent (in percent)   0.0010  
Unamortized financing costs   $ 0  
Commercial Paper | Standalone Commerical Paper Program      
Line of Credit Facility [Line Items]      
Credit facility remaining no of days (in days)   367 days  
Broker fee percent (in percent)   0.0005  
Approved issuance   $ 1,000,000,000  
Commercial paper notes   $ 100,000,000  
Average borrowing   5.35%  
Letter of Credit | Credit Enhanced Commercial Paper Note Program      
Line of Credit Facility [Line Items]      
Percentage of drawn letter of credit (in percent)   0.01325  
Unused letter of credit capacity (in percent)   0.35%  
Reduced percentage of letter of credit fee (in percent)   0.0010  
Letter of Credit | Credit Enhanced Commercial Paper Note Program | SOFR | Variable Rate Component One      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (in percent)   1.875%  
Letter of Credit | Credit Enhanced Commercial Paper Note Program | SOFR | Variable Rate Component Two      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (in percent)   0.10%