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Notes Payable (Notes Payable) (Details)	Sep. 30, 2022 USD ($) company	Aug. 15, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Principal	$ 6,781,963,000
Unamortized Costs	(41,512,000)
Book Value	6,740,451,000		$ 7,475,279,000
Fair Value	5,767,312,000		7,589,932,000
U.S. Dollar Denominated Unsecured Debt
Debt Instrument [Line Items]
Principal	5,250,000,000
Unamortized Costs	(27,630,000)
Book Value	5,222,370,000		5,717,998,000
Fair Value	$ 4,556,067,000		5,831,539,000
U.S. Dollar Denominated Unsecured Debt | Notes due September 15, 2022
Debt Instrument [Line Items]
Coupon Rate		2.37%
Principal		$ 500,000,000
Book Value			499,637,000
Fair Value			506,362,000
U.S. Dollar Denominated Unsecured Debt | Notes due April 23, 2024
Debt Instrument [Line Items]
Effective Rate	1.766%
Principal	$ 700,000,000
Unamortized Costs	(1,101,000)
Book Value	698,899,000		698,372,000
Fair Value	$ 685,550,000		700,314,000
U.S. Dollar Denominated Unsecured Debt | Notes due February 15, 2026
Debt Instrument [Line Items]
Coupon Rate	0.875%
Effective Rate	1.03%
Principal	$ 500,000,000
Unamortized Costs	(2,507,000)
Book Value	497,493,000		496,939,000
Fair Value	$ 436,666,000		488,141,000
U.S. Dollar Denominated Unsecured Debt | Notes due November 9, 2026
Debt Instrument [Line Items]
Coupon Rate	1.50%
Effective Rate	1.64%
Principal	$ 650,000,000
Unamortized Costs	(3,574,000)
Book Value	646,426,000		645,773,000
Fair Value	$ 573,097,000		649,996,000
U.S. Dollar Denominated Unsecured Debt | Notes due September 15, 2027
Debt Instrument [Line Items]
Coupon Rate	3.094%
Effective Rate	3.218%
Principal	$ 500,000,000
Unamortized Costs	(2,624,000)
Book Value	497,376,000		496,980,000
Fair Value	$ 459,630,000		535,206,000
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2028
Debt Instrument [Line Items]
Coupon Rate	1.85%
Effective Rate	1.962%
Principal	$ 650,000,000
Unamortized Costs	(3,768,000)
Book Value	646,232,000		645,724,000
Fair Value	$ 543,338,000		649,221,000
U.S. Dollar Denominated Unsecured Debt | Notes due November 9, 2028
Debt Instrument [Line Items]
Coupon Rate	1.95%
Effective Rate	2.044%
Principal	$ 550,000,000
Unamortized Costs	(2,939,000)
Book Value	547,061,000		546,701,000
Fair Value	$ 459,260,000		548,241,000
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2029
Debt Instrument [Line Items]
Coupon Rate	3.385%
Effective Rate	3.459%
Principal	$ 500,000,000
Unamortized Costs	(2,024,000)
Book Value	497,976,000		497,743,000
Fair Value	$ 450,179,000		545,580,000
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2031
Debt Instrument [Line Items]
Coupon Rate	2.30%
Effective Rate	2.419%
Principal	$ 650,000,000
Unamortized Costs	(5,869,000)
Book Value	644,131,000		643,617,000
Fair Value	$ 517,641,000		656,546,000
U.S. Dollar Denominated Unsecured Debt | Notes due November 9, 2031
Debt Instrument [Line Items]
Coupon Rate	2.25%
Effective Rate	2.322%
Principal	$ 550,000,000
Unamortized Costs	(3,224,000)
Book Value	546,776,000		546,512,000
Fair Value	$ 430,706,000		551,932,000
U.S. Dollar Denominated Unsecured Debt | SOFR | Notes due April 23, 2024
Debt Instrument [Line Items]
Interest rate spread	0.47%
Euro Denominated Unsecured Debt
Debt Instrument [Line Items]
Principal	$ 1,510,930,000
Unamortized Costs	(13,882,000)
Book Value	1,497,048,000		1,733,997,000
Fair Value	$ 1,190,542,000		1,734,185,000
Euro Denominated Unsecured Debt | Notes due April 12, 2024
Debt Instrument [Line Items]
Coupon Rate	1.54%
Effective Rate	1.54%
Principal	$ 97,984,000
Unamortized Costs	0
Book Value	97,984,000		113,431,000
Fair Value	$ 94,290,000		117,526,000
Euro Denominated Unsecured Debt | Notes due November 3, 2025
Debt Instrument [Line Items]
Coupon Rate	2.175%
Effective Rate	2.175%
Principal	$ 237,135,000
Unamortized Costs	0
Book Value	237,135,000		274,518,000
Fair Value	$ 227,663,000		295,256,000
Euro Denominated Unsecured Debt | Notes due September 9, 2030
Debt Instrument [Line Items]
Coupon Rate	0.50%
Effective Rate	0.64%
Principal	$ 685,890,000
Unamortized Costs	(8,890,000)
Book Value	677,000,000		784,287,000
Fair Value	$ 513,593,000		769,561,000
Euro Denominated Unsecured Debt | Notes due January 24, 2032
Debt Instrument [Line Items]
Coupon Rate	0.875%
Effective Rate	0.978%
Principal	$ 489,921,000
Unamortized Costs	(4,992,000)
Book Value	484,929,000		561,761,000
Fair Value	$ 354,996,000		551,842,000
Mortgage Debt
Debt Instrument [Line Items]
Number of real estate facilities securing debt | company	10
Net book value of real estate facilities securing notes payable	$ 57,500,000
Coupon Rate	3.811%
Effective Rate	3.811%
Principal	$ 21,033,000
Unamortized Costs	0
Book Value	21,033,000		23,284,000
Fair Value	$ 20,703,000		$ 24,208,000

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