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Notes Payable (Summary Of Indebtedness) (Details) - USD ($)

12 Months Ended

Dec. 31, 2020

Oct. 01, 2020

Dec. 31, 2019

Oct. 01, 2019

Dec. 31, 2018

Unsecured Debt

$ 3,166,625,000

$ 2,524,099,000

Total notes payable

^[1]

3,166,600,000

2,524,100,000

Long-term Debt

3,166,600,000

Commercial Banks [Member]

Unsecured Debt

39,700,000

143,700,000

Senior Unsecured Notes [Member]

Unsecured Debt

$ 3,126,900,000

2,380,400,000

2.70% Term loan Due 2022 | Commercial Banks [Member]

Unsecured Debt

$ 40,000,000.0

$ 99,700,000

Notes payable, effective interest rate

1.15%

2.70%

4.78% Notes Due 2021 | Senior Unsecured Notes [Member]

Unsecured Debt

$ 250,000,000

Notes payable, effective interest rate

4.78%

3.15% Notes Due 2022 | Senior Unsecured Notes [Member]

Unsecured Debt

$ 348,600,000

$ 348,000,000.0

Notes payable, effective interest rate

3.15%

3.15%

Debt Instrument, Maturity Date

Dec. 15, 2022

5.07% Notes Due 2023 | Senior Unsecured Notes [Member]

Unsecured Debt

$ 248,900,000

$ 248,400,000

Notes payable, effective interest rate

5.07%

5.07%

Debt Instrument, Maturity Date

Jun. 15, 2023

4.36% Notes Due 2024 | Senior Unsecured Notes [Member]

Unsecured Debt

$ 249,200,000

$ 249,000,000.0

Notes payable, effective interest rate

4.36%

4.36%

Debt Instrument, Maturity Date

Jan. 15, 2024

3.68% Notes Due 2024 | Senior Unsecured Notes [Member]

Unsecured Debt

$ 248,400,000

$ 248,000,000.0

Notes payable, effective interest rate

3.68%

3.68%

Debt Instrument, Maturity Date

Sep. 15, 2024

3.74% Notes Due 2028 | Senior Unsecured Notes [Member]

Unsecured Debt

$ 397,300,000

$ 396,700,000

Notes payable, effective interest rate

3.74%

3.74%

Debt Instrument, Maturity Date

Oct. 15, 2028

3.67% Notes due 2029 | Senior Unsecured Notes [Member]

Unsecured Debt

^[2]

$ 594,300,000

$ 593,700,000

Notes payable, effective interest rate

3.67%

Debt Instrument, Maturity Date

Jul. 01, 2029

3.41% Notes due 2049 | Senior Unsecured Notes [Member]

Unsecured Debt

$ 296,700,000

$ 296,600,000

Notes payable, effective interest rate

3.41%

3.41%

Debt Instrument, Maturity Date

Nov. 01, 2049

Secured Notes 4.38% Fixed Rate Mortgage Note Due 2045 [Member] | Secured Debt [Member]

Secured notes payable

$ 45,300,000

Notes payable, effective interest rate

4.38%

Unsecured Credit Facility [Member] | Commercial Banks [Member]

Unsecured Debt

$ 0

$ 44,000,000.0

[1]	Unamortized debt discounts and debt issuance costs of $23.4 million and $19.9 million are included in senior unsecured notes payable as of December 31, 2020 and 2019, respectively.
[2]	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%.

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