Debt - Narratives (Details)			3 Months Ended		6 Months Ended
	Jun. 14, 2019 USD ($)	Feb. 22, 2017 USD ($) option	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Feb. 22, 2017 EUR (€) option
Senior Unsecured Credit Facility
Line of credit, maximum borrowing amount		$ 2,350,000,000
Financing cost			$ 21,653,000		$ 21,653,000
Non Recourse Mortgage
Non-recourse mortgages, net			2,203,853,000		2,203,853,000		$ 2,732,658,000
Real estate carrying value			12,090,558,000		12,090,558,000		11,928,854,000
Prepayments of mortgage principal					493,317,000	$ 164,908,000
Repayments of non recourse mortgage loan					57,358,000	34,338,000
Decrease in value of balance sheet item due to foreign currency translation			4,187,000	$ 39,815,000	4,360,000	$ 21,299,000
Unamortized discount			38,655,000		38,655,000
Merged Entities
Non Recourse Mortgage
Unamortized discount			$ 20,600,000		$ 20,600,000
Six vacant properties
Non Recourse Mortgage
Number of real estate properties | property			6		6
Six vacant properties | CPA:17 – Global
Senior Unsecured Credit Facility
Principal Amount			$ 57,200,000		$ 57,200,000		57,200,000.0
Stated interest rate (percentage)			4.40%		4.40%
Non Recourse Mortgage
Non-recourse mortgages, net			$ 42,600,000		$ 42,600,000
Default interest rate (percentage)			5.00%		5.00%
Accrued interest on debt			$ 4,200,000		$ 4,200,000
Real estate carrying value			42,600,000		42,600,000
Vacant property | CPA:17 – Global
Senior Unsecured Credit Facility
Principal Amount			$ 8,700,000		$ 8,700,000
Stated interest rate (percentage)			5.50%		5.50%
Non Recourse Mortgage
Non-recourse mortgages, net			$ 8,200,000		$ 8,200,000
Default interest rate (percentage)			18.00%		18.00%
Accrued interest on debt			$ 300,000		$ 300,000
Real estate carrying value			$ 10,500,000		10,500,000
Operating Lease
Non Recourse Mortgage
Decrease in value of balance sheet item due to foreign currency translation					15,500,000
Operating Lease | Distribution Center In Inwood, West Virginia
Non Recourse Mortgage
Liabilities assumed					$ 20,200,000
Mortgage loan on real estate, interest rate (percent)					4.70%
Fixed interest rate
Non Recourse Mortgage
Weighted average interest rate			5.20%		5.20%
Variable interest rate
Non Recourse Mortgage
Weighted average interest rate			2.90%		2.90%
Unsecured senior notes
Senior Unsecured Credit Facility
Principal Amount			$ 3,900,000,000		$ 3,900,000,000
Financing cost			21,000,000.0		21,000,000.0		19,700,000
Non Recourse Mortgage
Unamortized discount			$ 18,100,000		$ 18,100,000		$ 15,800,000
Non-Recourse Debt
Non Recourse Mortgage
Weighted average interest rate			5.10%	2.50%	5.10%	2.50%
Prepayments of mortgage principal					$ 493,300,000
Repayments of non recourse mortgage loan					18,800,000	$ 9,500,000
Non-Recourse Debt | Disposed of by Means Other than Sale, Not Discontinued Operations
Non Recourse Mortgage
Prepayments of mortgage principal						12,500,000
Revolving Credit Facility
Senior Unsecured Credit Facility
Line of credit, maximum borrowing amount		$ 1,500,000,000
Number of extension options | option		2						2
Option extension term		6 months
Line of credit facility, available			$ 1,400,000,000		$ 1,400,000,000
Debt Instrument borrowing capacity fee (percentage)					0.20%
Delayed Draw term loan
Senior Unsecured Credit Facility
Line of credit, maximum borrowing amount		$ 100,000,000.0
Term Loan
Senior Unsecured Credit Facility
Line of credit, maximum borrowing amount | €								€ 236,300,000
Unsecured senior notes
Non Recourse Mortgage
Unamortized discount			18,100,000		$ 18,100,000
Unsecured senior notes | Government bond yield | Minimum
Senior Unsecured Credit Facility
Variable interest rate (percentage)					0.30%
Unsecured senior notes | Government bond yield | Maximum
Senior Unsecured Credit Facility
Variable interest rate (percentage)					0.35%
Non-Recourse Debt
Non Recourse Mortgage
Prepayments of mortgage principal						$ 164,900,000
Decrease in value of balance sheet item due to foreign currency translation					$ 18,400,000
3.850% Senior Notes due 2029 | Unsecured senior notes
Senior Unsecured Credit Facility
Principal Amount	$ 325,000,000.0		$ 325,000,000.0		$ 325,000,000.0
Stated interest rate (percentage)	3.85%		3.85%		3.85%
Price of Par Value (percentage)	98.876%		98.876%		98.876%
Debt instrument term	10 years 1 month 6 days
Financing cost			$ 2,900,000		$ 2,900,000