Land, Buildings and Improvements and Assets Held for Sale - Narratives (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) property $ / €	Jun. 30, 2021 USD ($) property	Jun. 30, 2022 USD ($) property $ / €	Jun. 30, 2021 USD ($) property	Dec. 31, 2021 USD ($) property $ / €
Real Estate Properties
Increase (decrease) in value of balance sheet item due to foreign currency translation	$ (43,993)	$ 5,973	$ (53,145)	$ (7,929)
Net investments in direct financing leases and loans receivable	530,318		530,318		$ 572,205
Land, buildings and improvements	12,026,671		12,026,671		$ 11,875,407
Investments in real estate
Capitalized construction cost			$ 46,400
Construction projects completed (property) | property			5		6
Unfunded commitment	34,000		$ 34,000		$ 55,300
Capitalized interest	400	600	1,100	1,300
Lease termination income			8,200
Lease payments	1,400	4,400	6,100	5,300
Assets held for sale, net	$ 0		$ 0		$ 8,269
EUR
Real Estate Properties
Decrease in exchange rate			(8.30%)
Foreign currency exchange rate | $ / €	1.0387		1.0387		1.1326
Real Estate
Real Estate Properties
Number of real estate properties (property) | property	1,357		1,357
Investments in real estate
Other income	$ 600	$ 400	$ 1,200	$ 900
Properties disposed of by sale
Investments in real estate
Number of properties sold (property) | property	8	10	14	12
Asset held for sale, not in discontinued operations
Real Estate Properties
Number of real estate properties (property) | property					2
Investments in real estate
Assets held for sale, net					$ 8,300
Land, buildings and improvements | Properties disposed of by sale
Investments in real estate
Number of properties sold (property) | property			12
Decrease in carrying value of real estate			$ 58,800
Construction in progress
Real Estate Properties
Number of real estate properties (property) | property	3		3
Investments in real estate
Funding commitment	$ 2,100		$ 2,100
Operating Lease
Real Estate Properties
Increase (decrease) in value of balance sheet item due to foreign currency translation			$ (328,800)
Number of real estate properties (property) | property	61		61
Depreciation	$ 73,000	$ 69,400	$ 145,000	$ 136,400
Operating real estate
Real Estate Properties
Depreciation	$ 700	$ 700	$ 1,400	$ 1,400
Self-storage | Operating real estate
Real Estate Properties
Number of real estate properties (property) | property	10		10		10
Hotel | Operating real estate
Real Estate Properties
Number of real estate properties (property) | property	1		1		1
Adjustments
Real Estate Properties
Net investments in direct financing leases and loans receivable	$ (17,300)		$ (17,300)
Land, buildings and improvements	$ 17,300		$ 17,300
Direct financing lease | Adjustments
Real Estate Properties
Number of real estate properties (property) | property	1		1