v3.26.1
Credit facility and commercial paper notes (Details) - USD ($)
3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Line of Credit Facility [Line Items]    
Credit facilities $ 1,338,000 $ 46,184,000
Commercial paper notes 113,000 $ 225,212,000
Credit Facilities | Unsecured Credit Facility    
Line of Credit Facility [Line Items]    
Principal amount 1,825,000,000  
Outstanding credit facility 1,000,000  
Unamortized financing costs $ 7,000,000  
Term loan fee (in percent) 1.875%  
Credit Facilities | Unsecured Credit Facility | SOFR    
Line of Credit Facility [Line Items]    
Variable rate 1.625%  
Credit Facilities | Unsecured Credit Facility | Prime Rate    
Line of Credit Facility [Line Items]    
Variable rate 0.625%  
Credit Facilities | Unsecured Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Credit facilities $ 0  
Credit Facilities | New Revolving Credit Facility | Additional Variable Rate    
Line of Credit Facility [Line Items]    
Variable rate 0.10%  
Commercial Paper | Credit Enhanced Commercial Paper Note Program    
Line of Credit Facility [Line Items]    
Principal amount $ 125,000,000  
Credit facilities $ 0  
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) 397 days  
Broker fee percent (in percent) 0.0005  
Approved issuance $ 1,000,000,000  
Commercial paper notes $ 0  
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]    
Variable rate 1.875%  
Letter of Credit | Credit Enhanced Commercial Paper Note Program | SOFR | Variable Rate Component Two    
Line of Credit Facility [Line Items]    
Variable rate 0.10%