Notes Payable (Summary Of Indebtedness) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Nov. 01, 2023
Total notes payable	[1]	$ 3,900,800,000	$ 3,485,600,000
Unsecured Debt		3,570,193,000	3,155,233,000
Secured Debt		330,597,000	330,358,000
Value Of Real Estate Assets At Cost Subject To Secured Notes		$ 1,385,100,000	1,358,600,000
Weighted Average Interest Rate	[2],[3]	3.90%
Commercial Banks [Member]
Unsecured Debt		$ 629,900,000	217,900,000
Senior Unsecured Notes [Member]
Unsecured Debt		$ 2,940,300,000	$ 2,937,300,000
4.87% Term loan Due 2026 | Commercial Banks [Member]
Notes payable, effective interest rate		4.87%	4.87%
Debt Instrument, Maturity Date		Sep. 30, 2026
Unsecured Debt		$ 39,900,000	$ 39,900,000
Unsecured Credit Facility [Member] | Commercial Banks [Member]
Notes payable, effective interest rate		5.14%
Commercial Paper | Commercial Banks [Member]
Unsecured Debt		$ 590,000,000.0	$ 0
Weighted Average Interest Rate		3.84%
5.00% Note, Due 2026 | Senior Unsecured Notes [Member]
Notes payable, effective interest rate		5.00%	5.00%	5.85%
Debt Instrument, Maturity Date		Nov. 03, 2026
Unsecured Debt	[4]	$ 504,000,000.0	$ 503,300,000
3.74% Notes Due 2028 | Senior Unsecured Notes [Member]
Notes payable, effective interest rate		3.74%	3.74%
Debt Instrument, Maturity Date		Oct. 15, 2028
Unsecured Debt		$ 399,400,000	$ 399,100,000
3.67% Notes due 2029 | Senior Unsecured Notes [Member]
Notes payable, effective interest rate		3.67%	3.67%
Debt Instrument, Maturity Date		Jul. 01, 2029
Unsecured Debt	[5]	$ 597,400,000	$ 596,800,000
2.91% Notes due 2030 | Senior Unsecured Notes [Member]
Notes payable, effective interest rate		2.91%	2.91%
Debt Instrument, Maturity Date		May 15, 2030
Unsecured Debt		$ 746,800,000	$ 746,000,000.0
5.06% Notes, Due 2034 | Senior Unsecured Notes [Member]
Notes payable, effective interest rate		5.06%	5.06%
Debt Instrument, Maturity Date		Jan. 15, 2034
Unsecured Debt		$ 395,700,000	$ 395,200,000
3.41% Notes due 2049 | Senior Unsecured Notes [Member]
Notes payable, effective interest rate		3.41%	3.41%
Debt Instrument, Maturity Date		Nov. 01, 2049
Unsecured Debt		$ 297,000,000.0	$ 296,900,000
3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028 | Secured Debt [Member]
Secured Debt		$ 291,500,000	291,400,000
3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028 | Secured Debt [Member] | Minimum [Member]
Notes payable, effective interest rate		3.78%
Debt Instrument, Maturity Date		Oct. 01, 2026
3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028 | Secured Debt [Member] | Maximum [Member]
Notes payable, effective interest rate		4.04%
Debt Instrument, Maturity Date		Apr. 01, 2028
3.87% note, due 2028 | Secured Debt [Member]
Notes payable, effective interest rate		3.87%
Debt Instrument, Maturity Date		Jan. 01, 2028
Secured Debt		$ 39,100,000	39,000,000.0
Floating Rate Notes Payable CV
Total notes payable	[6]	1,100,000,000
Unsecured Credit Facility [Member] | Commercial Banks [Member]
Unsecured Debt		$ 0	$ 178,000,000.0

[1] Balances are decreased by unamortized debt discounts, debt issuance costs, and fair market value adjustments, net of $10.1 million and $13.3 million as of December 31, 2025 and 2024, respectively.

[2] Includes all available extension options.

[3] Includes the effects of the applicable settled derivatives.

[4] Balances are increased by $4.9 million and $5.3 million for fair value adjustments due to changes in benchmark interest rates related to these notes as of December 31, 2025 and 2024, respectively. See Note 9. "Derivative Financial Instruments and Hedging Activities," for further discussion.

[5] The 2029 Notes have an effective annual interest rate of approximately 3.84% through June 2026, which includes the effect of a settled forward interest rate swap, and approximately 3.28% thereafter, for an all-in average effective rate of approximately 3.67%.

[6] Includes the senior unsecured notes payable and a term loan due in 2026 at December 31, 2025 and 2024. At December 31, 2025, the floating rate notes payable also includes the commercial paper notes. At December 31, 2024, it also reflects outstanding balances under our unsecured revolving credit facility.