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Notes Payable (Narrative) (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
yr
Mar. 31, 2025
USD ($)
Feb. 19, 2026
USD ($)
Dec. 31, 2025
USD ($)
Notes Payable [1] $ 4,250,500,000     $ 3,900,800,000
Unamortized debt discounts and debt issuance costs 17,300,000     10,100,000
Available amount under unsecured credit facility 1,200,000,000      
Repayment of notes payable $ 11,950,000 $ 0    
Weighted Average Interest Rate [2],[3] 4.10%      
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr 5.4      
Secured notes payable $ 318,708,000     330,597,000
Unsecured notes payable 3,931,761,000     3,570,193,000
Commercial Paper 600,000,000      
Letter Of Credit [Member]        
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility 50,000,000      
Commercial Banks [Member]        
Unsecured notes payable 398,700,000     629,900,000
Senior Unsecured Notes [Member]        
Unsecured notes payable 3,533,100,000     2,940,300,000
Secured Debt        
Secured notes payable $ 318,700,000     330,600,000
5.14% Unsecured revolving credit facility        
Terms Of Bid Rate Loans 180 days      
Value not exceeding the amount available under the line of credit $ 600,000,000      
Line of Credit Facility, Increase (Decrease), Net 300,000,000.0      
5.14% Unsecured revolving credit facility | September 2022 Credit Agreement        
Maximum borrowing capacity under unsecured credit facility 1,200,000,000      
Floating rate notes payable [Member]        
Notes Payable $ 900,800,000 [4]     $ 1,100,000,000
Weighted Average Interest Rate 4.50%     4.40%
3.85% Commercial Paper Program        
Debt Instrument, Term 30 days      
3.85% Commercial Paper Program | Commercial Banks [Member]        
Weighted Average Interest Rate 3.85%     3.84%
Unsecured notes payable $ 358,800,000     $ 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 4.97%      
Unsecured notes payable [5] $ 502,100,000     504,000,000.0
Hedged Asset, Fair Value Hedge (2,700,000)     $ (4,900,000)
Four Point Zero Nine Percentage 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%      
[1] Balances are decreased by unamortized debt discounts, debt issuance costs, and fair market value adjustments, net of $17.3 million and $10.1 million as of March 31, 2026 and December 31, 2025, respectively.
[2] Includes all available extension options.
[3] Includes the effects of the applicable settled derivatives.
[4] Includes the senior unsecured notes payable and a term loan due in 2026, and the commercial paper notes at March 31, 2026 and December 31, 2025.
[5] Balances are increased by $2.7 million and $4.9 million for fair value adjustments due to changes in benchmark interest rates related to these notes as of March 31, 2026 and December 31, 2025, respectively. See Note 7. "Derivative Financial Instruments and Hedging Activities," for further discussion.