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v3.20.4

Notes Payable (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Dec. 31, 2020 USD ($) yr | Dec. 31, 2020 USD ($) yr | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 16, 2020 USD ($) | Oct. 01, 2019 USD ($)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  | $ 23,400,000 | $ 23,400,000 | $ 19,900,000 |  |  |
Current Fiscal Year End Date |  |  |  | --12-31 |  |  |  |
Unsecured Debt |  |  | 3,166,625,000 | $ 3,166,625,000 | 2,524,099,000 |  |  |
Total notes payable | [1] |  | 3,166,600,000 | 3,166,600,000 | 2,524,100,000 |  |  |
Loss on early retirement of debt |  |  |  | 176,000 | 11,995,000 | $ 0 |  |
Available amount under unsecured credit facility |  |  | $ 888,000,000.0 | $ 888,000,000.0 |  |  |  |
Weighted average interest rate on floating rate debt | [2] |  | 3.60% | 3.60% |  |  |  |
Weighted average maturity of indebtedness (including unsecured credit facility and unsecured short-term borrowings) (in years) | yr |  |  | 8.4 | 8.4 |  |  |  |
Letter Of Credit [Member] |  |  |  |  |  |  |  |
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility |  |  | $ 50,000,000 | $ 50,000,000 |  |  |  |
Outstanding balance under credit facility |  |  | 12,000,000.0 | 12,000,000.0 |  |  |  |
Commercial Banks [Member] |  |  |  |  |  |  |  |
Unsecured Debt |  |  | 39,700,000 | 39,700,000 | 143,700,000 |  |  |
Commercial Banks [Member] | Unsecured Credit Facility [Member] |  |  |  |  |  |  |  |
Unsecured Debt |  |  | 0 | 0 | 44,000,000.0 |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Unsecured Debt |  |  | $ 3,126,900,000 | $ 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% | 1.15% | 2.70% |  |  |
2.70% Term loan Due 2022 | Unsecured Debt [Member] |  |  |  |  |  |  |  |
Repayments of Unsecured Debt |  | $ 100,000,000.0 |  |  |  |  |  |
3.74% Notes Due 2028 | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Unsecured Debt |  |  | $ 397,300,000 | $ 397,300,000 | $ 396,700,000 |  |  |
Debt Instrument, Maturity Date |  |  |  | Oct. 15, 2028 |  |  |  |
Notes payable, effective interest rate |  |  |  |  | 3.74% | 3.74% |  |
Unsecured Credit Facility [Member] |  |  |  |  |  |  |  |
Value not exceeding the amount available under the unsecured credit facility |  |  |  | $ 450,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 900,000,000 | $ 900,000,000 |  |  |  |
Terms Of Bid Rate Loans |  |  |  | 180 days |  |  |  |
Floating Rate Notes Payable [Member] |  |  |  |  |  |  |  |
Total notes payable |  |  | $ 39,700,000 | $ 39,700,000 | $ 143,700,000 |  |  |
Weighted average interest rate on floating rate debt |  |  | 1.90% | 1.90% | 2.70% |  |  |
3.67% Notes due 2029 | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Unsecured Debt | [3] |  | $ 594,300,000 | $ 594,300,000 | $ 593,700,000 |  |  |
Debt Instrument, Maturity Date |  |  |  | Jul. 01, 2029 |  |  |  |
Notes payable, effective interest rate |  |  |  |  | 3.67% |  |  |
3.41% Notes due 2049 | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Unsecured Debt |  |  | $ 296,700,000 | $ 296,700,000 | $ 296,600,000 |  |  |
Debt Instrument, Maturity Date |  |  |  | Nov. 01, 2049 |  |  |  |
Notes payable, effective interest rate |  |  | 3.41% | 3.41% | 3.41% |  |  |
4.78% Notes Due 2021 | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  | $ 250,000,000
Notes payable, effective interest rate |  |  |  |  |  |  |  | 4.78%
Secured Notes 4.38% Fixed Rate Mortgage Note Due 2045 [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  | $ 45,300,000
Notes payable, effective interest rate |  |  |  |  |  |  |  | 4.38%
Unsecured notes 2.80% due 2030 [Member] [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 750,000,000 |
Discounted notes payable face amount |  |  | 99.929% |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.80% |
Proceeds from Issuance of Debt |  |  | $ 743,100,000 |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  | 2.91% |  |  |  |  |
3.15% Notes Due 2022 | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Unsecured Debt |  |  | $ 348,600,000 | $ 348,600,000 | $ 348,000,000.0 |  |  |
Debt Instrument, Maturity Date |  |  |  | Dec. 15, 2022 |  |  |  |
Notes payable, effective interest rate |  |  | 3.15% | 3.15% | 3.15% |  |  |
[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] | Includes the effects of the applicable settled forward interest rate swaps.
[3] | 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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