v3.26.1
Notes Payable (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
yr
Jun. 30, 2026
USD ($)
yr
Jun. 30, 2025
USD ($)
Jul. 08, 2026
USD ($)
Feb. 19, 2026
USD ($)
Dec. 31, 2025
USD ($)
Notes Payable   $ 4,848,300,000 $ 4,848,300,000       $ 3,900,800,000
Unamortized debt discounts and debt issuance costs   17,600,000 17,600,000       10,100,000
Available amount under unsecured credit facility   $ 842,700,000 842,700,000        
Repayment of notes payable     $ 11,950,000 $ 0      
Weighted Average Interest Rate   4.10% 4.10%        
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr   4.9 4.9        
Secured notes payable   $ 318,755,000 $ 318,755,000       330,597,000
Unsecured notes payable   4,529,573,000 4,529,573,000       3,570,193,000
Commercial Paper   600,000,000 600,000,000        
Letters of Credit Outstanding, Amount   300,000 300,000        
Letter Of Credit [Member]              
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility   50,000,000 50,000,000        
Commercial Banks [Member]              
Unsecured notes payable   997,000,000.0 997,000,000.0       629,900,000
Senior Unsecured Notes [Member]              
Unsecured notes payable   3,532,600,000 3,532,600,000       2,940,300,000
Secured Debt              
Secured notes payable   318,700,000 318,700,000       330,600,000
4.30% Unsecured revolving credit facility              
Line of Credit Facility, Increase (Decrease), Net   300,000,000.0          
4.30% Unsecured revolving credit facility | March 2026 Credit Agreement              
Maximum borrowing capacity under unsecured credit facility   $ 1,200,000,000 $ 1,200,000,000        
Terms Of Bid Rate Loans     180 days        
Value not exceeding the amount available under the line of credit     $ 600,000,000        
4.30% Unsecured revolving credit facility | Commercial Banks [Member]              
Notes payable, effective interest rate   4.30% 4.30%        
Unsecured notes payable   $ 357,000,000.0 $ 357,000,000.0       0
Floating rate notes payable [Member]              
Notes Payable   $ 1,500,000,000 $ 1,500,000,000       $ 1,100,000,000
Weighted Average Interest Rate   4.30% 4.30%       4.40%
3.83% Commercial Paper Program              
Debt Instrument, Term   30 days          
3.83% Commercial Paper Program | Commercial Banks [Member]              
Weighted Average Interest Rate   3.83% 3.83%       3.84%
Unsecured notes payable   $ 600,000,000.0 $ 600,000,000.0       $ 590,000,000.0
4.97% Notes, due 2026 | Senior Unsecured Notes [Member]              
Debt Instrument, Maturity Date     Nov. 03, 2026        
Notes payable, effective interest rate   4.96% 4.96%        
Unsecured notes payable   $ 501,000,000.0 $ 501,000,000.0       504,000,000.0
Hedged Asset, Fair Value Hedge   $ (1,400,000) (1,400,000)       (4,900,000)
5.03% Notes, due 2036 | Senior Unsecured Notes [Member]              
Notes payable, effective interest rate           4.90%  
Debt Instrument, Face Amount           $ 600,000,000.0  
Proceeds from Issuance of Debt     $ 594,000,000.0        
Debt Instrument, Interest Rate During Period   4.91%          
Discounted Notes Payable Face Amount     99.94%        
3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028 | Secured Debt              
Repayment of notes payable $ 12,000,000.0            
Secured notes payable   $ 279,600,000 $ 279,600,000       $ 291,500,000
3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028 | Secured Debt | Minimum [Member]              
Debt Instrument, Maturity Date     Oct. 01, 2026        
Notes payable, effective interest rate   3.78% 3.78%        
3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028 | Secured Debt | Maximum [Member]              
Debt Instrument, Maturity Date     Apr. 01, 2028        
Notes payable, effective interest rate   4.01% 4.01%        
2026 Term loan | Commercial Banks [Member] | Subsequent Event [Member]              
Unsecured notes payable         $ 350,000,000.0