Land, Buildings and Improvements, and Assets Held for Sale - Narratives (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) property $ / €	Sep. 30, 2022 USD ($) property	Sep. 30, 2023 USD ($) property $ / €	Sep. 30, 2022 USD ($) property	Dec. 31, 2022 USD ($) property $ / €	Mar. 31, 2023 property	Feb. 28, 2023 USD ($) property
Real Estate Properties
Increase (decrease) in value of balance sheet item due to foreign currency translation	$ (8,844)	$ (56,053)	$ 7,092	$ (109,198)
Land, buildings and improvements — net lease and other	13,390,692		13,390,692		$ 13,338,857
Net investments in finance leases and loans receivable	476,410		476,410		$ 498,313
Investments in real estate
Capitalized construction cost			$ 72,600
Construction projects completed (property) | property			12		8
Unfunded commitment	94,400		$ 94,400		$ 61,100
Capitalized interest	200	300	300	1,300
Lease payments	1,700	3,800	7,300	10,000
Lease termination income		$ 4,200	11,400	8,200
Payment to acquire real estate			908,271	$ 1,013,950
Assets held for sale, net	$ 102,015		$ 102,015		$ 57,944
Asset Held for Sale, Not in Discontinued Operations
Real Estate Properties
Number of real estate properties (property) | property	8		8		3
Investments in real estate
Loss on sale of real estate	$ 11,700		$ 11,700
Assets held for sale, net	$ 102,000		$ 102,000		$ 57,900
Properties Disposed of by Sale
Real Estate Properties
Number of real estate properties (property) | property						2
Investments in real estate
Number of properties sold | property	6	3	14	17
Land, Buildings and Improvements | Properties Disposed of by Sale
Real Estate Properties
Increase (decrease) in carrying value of real estate			$ (93,400)
Investments in real estate
Number of properties sold | property			9
Decrease in carrying value of real estate			$ 93,400
Real Estate
Real Estate Properties
Number of real estate properties (property) | property	1,472		1,472
Investments in real estate
Other income		$ 200		$ 1,500
Real Estate | Asset Held for Sale, Not in Discontinued Operations
Real Estate Properties
Number of real estate properties (property) | property	6		6
Operating Lease
Real Estate Properties
Increase (decrease) in value of balance sheet item due to foreign currency translation			$ (28,700)
Number of real estate properties (property) | property	47		47
Depreciation	$ 80,900	76,000	$ 251,900	221,000
Investments in real estate
Payment to acquire real estate			888,647
Operating Lease | In-place lease intangible assets and other
Investments in real estate
Payment to acquire real estate			$ 142,073
Finite lived intangible assets useful life (in years)	21 years 10 months 24 days		21 years 10 months 24 days
Operating Lease | Land
Investments in real estate
Payment to acquire real estate			$ 135,502
Operating Lease | Buildings and improvements
Investments in real estate
Payment to acquire real estate			$ 604,973
Operating Real Estate
Real Estate Properties
Number of real estate properties (property) | property	2		2
Depreciation	$ 7,800	$ 4,100	$ 22,700	$ 5,400
Investments in real estate
Payment to acquire real estate			19,286
Operating Real Estate | In-place lease intangible assets and other
Investments in real estate
Payment to acquire real estate			$ 579
Finite lived intangible assets useful life (in years)	6 months		6 months
Operating Real Estate | Land
Investments in real estate
Payment to acquire real estate			$ 5,404
Operating Real Estate | Buildings and improvements
Investments in real estate
Payment to acquire real estate			$ 13,303
Hotel | Real Estate
Real Estate Properties
Number of real estate properties (property) | property	10		10
Investments in real estate
Number of properties sold | property	3
Hotel | Real Estate | Land, Buildings and Improvements
Investments in real estate
Decrease in operating properties	$ 38,700		$ 38,700
Hotel | Real Estate | Asset Held for Sale, Not in Discontinued Operations
Real Estate Properties
Number of real estate properties (property) | property	3		3
Investments in real estate
Decrease in operating properties	$ 50,800		$ 50,800
Hotel | Operating Real Estate
Real Estate Properties
Number of real estate properties (property) | property	5		5		1
Build To Suit
Real Estate Properties
Number of real estate properties (property) | property	3		3
Investments in real estate
Funding commitment	$ 80,600		$ 80,600
Self- Storage | Operating Real Estate
Real Estate Properties
Number of real estate properties (property) | property	77		77		75
British Pound Sterling
Real Estate Properties
Increase (decrease) in carrying value of real estate			$ 1,500
Investments in real estate
Decrease in carrying value of real estate			$ (1,500)
Student Housing | Operating Real Estate
Real Estate Properties
Number of real estate properties (property) | property	2		2		2
Adjustments
Real Estate Properties
Land, buildings and improvements — net lease and other	$ 25,400		$ 25,400
Net investments in finance leases and loans receivable	$ (25,400)		$ (25,400)
Adjustments | Hotel
Real Estate Properties
Land, buildings and improvements — net lease and other							$ 164,600
Adjustments | Hotel | Real Estate
Real Estate Properties
Number of real estate properties (property) | property							12
Adjustments | Hotel | Real Estate | Asset Held for Sale, Not in Discontinued Operations
Real Estate Properties
Number of real estate properties (property) | property	5		5
Adjustments | Student Housing
Real Estate Properties
Land, buildings and improvements — net lease and other	$ 24,600		$ 24,600
Adjustments | Direct Financing Lease
Real Estate Properties
Number of real estate properties (property) | property	78		78
Increase (decrease) in carrying value of real estate			$ (288,200)
Investments in real estate
Decrease in carrying value of real estate			$ 288,200
Adjustments | Land, Buildings and Improvements — Net Lease and Other
Real Estate Properties
Number of real estate properties (property) | property	5		5
EUR
Real Estate Properties
Decrease in exchange rate (as a percent)			0.70%
Foreign currency exchange rate | $ / €	1.0594		1.0594		1.0666