Fair Value of Financial Instruments (Estimated Fair Value And Carrying Amounts) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 10,861,382	$ 11,236,731
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 10,189,343	11,181,880
Senior Notes \| 2.625% notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	2.625%
Senior Notes \| 2.750% notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	2.75%
Senior Notes \| 3.300% notes due 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.30%
Level 2 \| Global revolving credit facilities, net \| Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	$ 245,766	1,663,156
Level 2 \| Global revolving credit facilities, net \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	245,766	1,663,156
Level 2 \| Unsecured term loans \| Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	813,205	1,183,121
Level 2 \| Unsecured term loans \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	813,205	1,183,121
Level 2 \| Unsecured senior notes \| Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured senior notes	9,697,166	7,684,368
Level 2 \| Unsecured senior notes \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured senior notes	9,025,229	7,629,679
Level 2 \| Mortgage loans \| Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	105,245	706,086
Level 2 \| Mortgage loans \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	$ 105,143	$ 705,924

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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