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Notes Payable (Narrative) (Details)							3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 09, 2021 USD ($)	Apr. 23, 2021 USD ($)	Jan. 24, 2020 USD ($)	Apr. 12, 2016 USD ($)	Nov. 03, 2015 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) tranche	Sep. 30, 2020 USD ($)	Sep. 30, 2021	Sep. 09, 2021 EUR (€)	Jan. 19, 2021 USD ($)	Jan. 24, 2020 EUR (€)	Apr. 12, 2016 EUR (€)	Nov. 03, 2015 EUR (€)
Debt Instrument [Line Items]
Proceeds from Issuance of Unsecured Debt									$ 3,300,160,000	$ 545,151,000
Foreign currency exchange gain (loss)							$ 40,906,000	$ (41,900,000)	73,584,000	(52,250,000)
Cash paid for interest expense									49,800,000	40,200,000
Interest capitalized as real estate									$ 2,600,000	$ 2,500,000
Mortgage Notes | Minimum
Debt Instrument [Line Items]
Interest rate	3.20%						3.20%		3.20%		3.20%
Mortgage Notes | Maximum
Debt Instrument [Line Items]
Interest rate	7.10%						7.10%		7.10%		7.10%
U.S. Dollar Denominated Unsecured Debt
Debt Instrument [Line Items]
Debt to Total Assets ratio									14.00%
Adjusted EBTIDA to interest Expense ratio											33
U.S. Dollar Denominated Unsecured Debt | Minimum
Debt Instrument [Line Items]
Adjusted EBTIDA to interest Expense ratio									1.5
U.S. Dollar Denominated Unsecured Debt | Notes due February 15, 2026
Debt Instrument [Line Items]
Debt issuance amount													$ 500,000,000
Interest rate	0.875%						0.875%		0.875%		0.875%		0.875%
Debt issuance costs													$ 3,800,000
U.S. Dollar Denominated Unsecured Debt | Notes due April 23, 2024
Debt Instrument [Line Items]
Debt issuance amount			$ 700,000,000
Reset quarterly rate									0.495%
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2028
Debt Instrument [Line Items]
Debt issuance amount			$ 650,000,000
Interest rate	1.85%		1.85%				1.85%		1.85%		1.85%
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2031
Debt Instrument [Line Items]
Debt issuance amount			$ 650,000,000
Interest rate	2.30%		2.30%				2.30%		2.30%		2.30%
U.S. Dollar Denominated Unsecured Debt | Notes due April 23, 2024, May 1, 2028 and May 1, 2031
Debt Instrument [Line Items]
Debt issuance costs			$ 13,700,000
U.S. Dollar Denominated Unsecured Debt | Maximum Covenant
Debt Instrument [Line Items]
Debt to Total Assets ratio									65.00%
Euro Denominated Unsecured Debt
Debt Instrument [Line Items]
Number of tranches | tranche									4
Euro Denominated Unsecured Debt | Notes due November 3, 2025
Debt Instrument [Line Items]
Debt issuance amount | €																€ 242,000,000
Interest rate	2.175%						2.175%		2.175%		2.175%
Proceeds from Issuance of Unsecured Debt						$ 264,300,000
Euro Denominated Unsecured Debt | Notes due April 12, 2024
Debt Instrument [Line Items]
Debt issuance amount | €															€ 100,000,000
Interest rate	1.54%						1.54%		1.54%		1.54%
Proceeds from Issuance of Unsecured Debt					$ 113,600,000
Euro Denominated Unsecured Debt | Notes due January 24, 2032
Debt Instrument [Line Items]
Debt issuance amount | €														€ 500,000,000
Interest rate	0.875%						0.875%		0.875%		0.875%
Proceeds from Issuance of Unsecured Debt				$ 545,200,000
Euro Denominated Unsecured Debt | Notes due September 9, 2030
Debt Instrument [Line Items]
Debt issuance amount | €												€ 700,000,000
Interest rate	0.50%						0.50%		0.50%		0.50%
Proceeds from Issuance of Unsecured Debt		$ 817,600,000
SOFR | U.S. Dollar Denominated Unsecured Debt | Notes due April 23, 2024
Debt Instrument [Line Items]
Interest rate spread	0.47%		0.47%

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