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Unsecured senior notes payable, LOC, and commercial paper (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 28, 2025
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jun. 30, 2025
Apr. 30, 2025
Feb. 28, 2025
Debt Instrument                    
Principal   $ 13,675,000     $ 13,675,000          
Loss on early extinguishment of debt   (107)   $ 0 (107) $ 0        
Debt Balance at 100%   $ 13,593,541     13,593,541          
Repayments of secured debt         $ 154,212 $ 32        
Effective rate (as a percent)   3.97%     3.97%          
Commercial Paper                    
Debt Instrument                    
Principal   $ 1,500,000     $ 1,500,000          
Commercial paper, maximum issuance   2,500,000     $ 2,500,000          
Weighted-average yield to maturity, commercial paper         4.64%          
Weighted-average remaining maturity term, commercial paper         17 days          
Commercial Paper | Minimum                    
Debt Instrument                    
Debt Instrument, Term         30 days          
Commercial Paper | Maximum                    
Debt Instrument                    
Debt Instrument, Term         397 days          
5.25% Unsecured Senior Notes Payable                    
Debt Instrument                    
Principal   $ 400,000     $ 400,000         $ 550,000
Stated interest rate (as a percent)   5.25%     5.25%         5.50%
Debt Balance at 100%   $ 396,147     $ 396,147          
Effective rate (as a percent)   5.38%     5.38%          
3.45% Unsecured Senior Notes Payable                    
Debt Instrument                    
Principal                 $ 600,000  
Stated interest rate (as a percent)                 3.45%  
Loss on early extinguishment of debt $ 0                  
Unsecured senior line of credit                    
Debt Instrument                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 5,000,000     $ 5,000,000          
Applicable margin (as a percent)         0.855%   0.875%      
Annual facility fee (as a percent)         0.145%   0.15%      
Interest rate adjustment amount, maximum   0.04%     0.04%          
Facility fee rate adjustment amount, maximum   0.01%     0.01%          
Interest rate adjustment amount, decrease     0.02%              
Facility fee rate adjustment amount, decrease     0.005%              
Debt Balance at 100%   $ 0     $ 0          
Unsecured senior line of credit | Commercial Paper                    
Debt Instrument                    
Principal   1,550,000     1,550,000          
Debt Balance at 100%   $ 1,548,542     $ 1,548,542          
Effective rate (as a percent)   4.52%     4.52%          
Secured notes payable maturing on 11/19/26 | 99 Coolidge Avenue                    
Debt Instrument                    
Loss on early extinguishment of debt   $ 107                
Repayments of secured debt   $ 154,600                
Effective rate (as a percent)               7.18%