Debt (Details)		6 Months Ended
	Mar. 26, 2020 USD ($) extension	Jun. 30, 2021 USD ($) extension	Jun. 30, 2021 CAD ($) extension	Jun. 30, 2021 EUR (€) extension	Dec. 31, 2020 USD ($)	Dec. 30, 2020 EUR (€)	Jun. 30, 2020 USD ($)	Mar. 26, 2020 CAD ($) extension	Apr. 26, 2019 USD ($)	Nov. 06, 2018 USD ($)	May 01, 2013 USD ($)
Mortgages, Senior Notes and Term Loans
Debt Instrument [Line Items]
Carrying Amount		$ 2,578,263,000			$ 2,664,218,000
Estimated Fair Value		2,706,589,000			2,827,440,000
Less: unamortized deferred financing costs		(11,994,000)			(15,952,000)
Total debt net of unamortized deferred financing costs		2,566,269,000			2,648,266,000
Mortgage Loans | 2013 Mortgage Loans
Debt Instrument [Line Items]
Carrying Amount		273,197,000			276,693,000
Estimated Fair Value		$ 282,154,000			285,772,000
Face amount of debt											$ 322,000,000.0
Mortgage Loans | Senior note
Debt Instrument [Line Items]
Contractual Interest Rate		3.81%	3.81%	3.81%
Effective Interest Rate as of June 30, 2021		4.14%	4.14%	4.14%
Carrying Amount		$ 171,197,000			174,693,000
Estimated Fair Value		$ 177,189,000			180,807,000
Mortgage Loans | Mezzanine A
Debt Instrument [Line Items]
Contractual Interest Rate		7.38%	7.38%	7.38%
Effective Interest Rate as of June 30, 2021		7.55%	7.55%	7.55%
Carrying Amount		$ 70,000,000			70,000,000
Estimated Fair Value		$ 71,925,000			71,925,000
Mortgage Loans | Mezzanine B
Debt Instrument [Line Items]
Contractual Interest Rate		11.50%	11.50%	11.50%
Effective Interest Rate as of June 30, 2021		11.75%	11.75%	11.75%
Carrying Amount					32,000,000		$ 32,000,000
Estimated Fair Value		$ 33,040,000			33,040,000
Senior Notes | Senior Unsecured Notes
Debt Instrument [Line Items]
Carrying Amount		1,839,311,000			1,866,200,000
Estimated Fair Value		$ 1,961,129,000			2,022,950,000
Senior Notes | Series D 1.62% notes due 2031
Debt Instrument [Line Items]
Contractual Interest Rate		1.62%	1.62%	1.62%		1.62%
Effective Interest Rate as of June 30, 2021		1.67%	1.67%	1.67%
Carrying Amount		$ 474,281,000			488,640,000
Estimated Fair Value		$ 471,356,000			488,640,000
Face amount of debt | €				€ 400,000,000.0		€ 400,000,000.00
Senior Notes | Series E 1.65% notes due 2033
Debt Instrument [Line Items]
Contractual Interest Rate		1.65%	1.65%	1.65%		1.65%
Effective Interest Rate as of June 30, 2021		1.70%	1.70%	1.70%
Carrying Amount		$ 415,030,000			427,560,000
Estimated Fair Value		$ 411,398,000			427,560,000
Face amount of debt | €				€ 350,000,000.0		€ 350,000,000.00
Senior Notes | Series C notes
Debt Instrument [Line Items]
Contractual Interest Rate		4.10%	4.10%	4.10%					4.10%
Effective Interest Rate as of June 30, 2021		4.15%	4.15%	4.15%
Carrying Amount		$ 350,000,000			350,000,000
Estimated Fair Value		$ 389,375,000			400,750,000
Face amount of debt									$ 350,000,000.0
Senior Notes | Series A notes
Debt Instrument [Line Items]
Contractual Interest Rate		4.68%	4.68%	4.68%						4.68%
Effective Interest Rate as of June 30, 2021		4.77%	4.77%	4.77%
Carrying Amount		$ 200,000,000			200,000,000
Estimated Fair Value		$ 224,000,000			231,000,000
Face amount of debt										$ 200,000,000.0
Senior Notes | Series B notes
Debt Instrument [Line Items]
Contractual Interest Rate		4.86%	4.86%	4.86%						4.86%
Effective Interest Rate as of June 30, 2021		4.92%	4.92%	4.92%
Carrying Amount		$ 400,000,000			400,000,000
Estimated Fair Value		465,000,000			475,000,000
Face amount of debt										$ 400,000,000.0
Term Loans | Total 2020 Senior Unsecured Term Loan A Facility
Debt Instrument [Line Items]
Carrying Amount		326,650,000			521,325,000
Estimated Fair Value		$ 324,201,000			518,718,000
Term Loans | 2020 Senior Unsecured Term Loan Tranche A-1
Debt Instrument [Line Items]
Effective Interest Rate as of June 30, 2021		1.42%	1.42%	1.42%
Carrying Amount		$ 125,000,000			325,000,000
Estimated Fair Value		$ 124,063,000			323,375,000
Face amount of debt	$ 125,000,000.0
Term Loans | 2020 Senior Unsecured Term Loan Tranche A-1 | LIBOR
Debt Instrument [Line Items]
Contractual Interest Rate		0.95%
Term Loans | 2020 Senior Unsecured Term Loan Tranche A-2
Debt Instrument [Line Items]
Effective Interest Rate as of June 30, 2021		1.51%	1.51%	1.51%
Carrying Amount		$ 201,650,000			196,325,000
Estimated Fair Value		$ 200,138,000			195,343,000
Face amount of debt			$ 250,000,000.0					$ 250,000,000.0
Term Loans | 2020 Senior Unsecured Term Loan Tranche A-2 | CDOR
Debt Instrument [Line Items]
Contractual Interest Rate		0.95%
Term Loans | Twenty Twenty Senior Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Carrying Amount		$ 139,105,000			0
Estimated Fair Value		$ 139,105,000			0
Term Loans | 2020 Senior Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Effective Interest Rate as of June 30, 2021		1.07%	1.07%	1.07%
Carrying Amount		$ 94,742,000			0
Estimated Fair Value		$ 94,742,000			0
Term Loans | 2020 Senior Unsecured Revolving Credit Facility | CDOR
Debt Instrument [Line Items]
Contractual Interest Rate		0.85%
Revolving Credit Facility | Line of Credit | 2020 Senior Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Effective Interest Rate as of June 30, 2021		1.34%	1.34%	1.34%
Carrying Amount		$ 44,363,000			0			$ 800,000,000
Estimated Fair Value		$ 44,363,000			$ 0
Number of extensions | extension	2	2	2	2				2
Extension term	6 months	6 months
Revolving Credit Facility | Line of Credit | 2020 Senior Unsecured Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Contractual Interest Rate		0.85%