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Contractual interest rate for funds borrowed, under the debt agreement.

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Debt - Mortgage Debt (Details) £ in Millions	1 Months Ended	6 Months Ended
Debt - Mortgage Debt (Details) £ in Millions	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) facility	Jun. 30, 2018 GBP (£) facility	Dec. 31, 2017 USD ($)
Debt Instrument
Total debt before discount, net		$ 7,353,401,000
(Discounts), premiums and debt costs, net		(43,429,000)
Debt instruments, carrying amount		7,309,972,000
Term loan		222,923,000		$ 228,288,000
Other debt		93,070,000		$ 94,165,000
Debt maturing in 2018
Debt Instrument
2018 (nine months)		1,710,000
Debt maturing in 2019
Debt Instrument
2019		676,692,000
Debt maturing in 2020
Debt Instrument
2020		803,609,000
Debt maturing in 2021
Debt Instrument
2021		1,256,183,000
Debt maturing in 2022
Debt Instrument
2022		902,691,000
Thereafter
Debt Instrument
Thereafter		$ 3,712,516,000
Mortgage Debt
Debt Instrument
Number of healthcare facilities used to secure debt \| facility		15	15
Debt instrument, collateral, healthcare facilities carrying value		$ 284,000,000
Repayments of debt	$ 472,000,000
Total debt before discount, net		135,044,000
(Discounts), premiums and debt costs, net		5,277,000
Debt instruments, carrying amount		$ 140,321,000
Weighted-average interest rate (as a percent)		4.19%	4.19%
Weighted-average maturity		19 years
Mortgage Debt \| Minimum
Debt Instrument
Percentage of stated interest rate		2.25%	2.25%
Mortgage Debt \| Maximum
Debt Instrument
Percentage of stated interest rate		5.91%	5.91%
Mortgage Debt \| Debt maturing in 2018
Debt Instrument
2018 (nine months)		$ 1,710,000
Mortgage Debt \| Debt maturing in 2019
Debt Instrument
2019		3,561,000
Mortgage Debt \| Debt maturing in 2020
Debt Instrument
2020		3,609,000
Mortgage Debt \| Debt maturing in 2021
Debt Instrument
2021		10,957,000
Mortgage Debt \| Debt maturing in 2022
Debt Instrument
2022		2,691,000
Mortgage Debt \| Thereafter
Debt Instrument
Thereafter		112,516,000
Bank Line of Credit
Debt Instrument
Total debt before discount, net		545,226,000
(Discounts), premiums and debt costs, net		0
Debt instruments, carrying amount		545,226,000
Bank Line of Credit \| Debt maturing in 2018
Debt Instrument
2018 (nine months)		0
Bank Line of Credit \| Debt maturing in 2019
Debt Instrument
2019		0
Bank Line of Credit \| Debt maturing in 2020
Debt Instrument
2020		0
Bank Line of Credit \| Debt maturing in 2021
Debt Instrument
2021		545,226,000
Bank Line of Credit \| Debt maturing in 2022
Debt Instrument
2022		0
Bank Line of Credit \| Thereafter
Debt Instrument
Thereafter		0
Term loans
Debt Instrument
Total debt before discount, net		223,131,000
(Discounts), premiums and debt costs, net		(208,000)
Debt instruments, carrying amount		222,923,000
Term loans \| Debt maturing in 2018
Debt Instrument
2018 (nine months)		0
Term loans \| Debt maturing in 2019
Debt Instrument
2019		223,131,000
Term loans \| Debt maturing in 2020
Debt Instrument
2020		0
Term loans \| Debt maturing in 2021
Debt Instrument
2021		0
Term loans \| Debt maturing in 2022
Debt Instrument
2022		0
Term loans \| Thereafter
Debt Instrument
Thereafter		0
Unsecured Debt
Debt Instrument
Repayments of debt		0
Total debt before discount, net		6,450,000,000
(Discounts), premiums and debt costs, net		(48,498,000)
Debt instruments, carrying amount		$ 6,401,502,000
Weighted-average interest rate (as a percent)		4.20%	4.20%
Weighted-average maturity		5 years
Unsecured Debt \| Minimum
Debt Instrument
Percentage of stated interest rate		2.79%	2.79%
Unsecured Debt \| Maximum
Debt Instrument
Percentage of stated interest rate		6.88%	6.88%
Unsecured Debt \| Debt maturing in 2018
Debt Instrument
2018 (nine months)		$ 0
Unsecured Debt \| Debt maturing in 2019
Debt Instrument
2019		450,000,000
Unsecured Debt \| Debt maturing in 2020
Debt Instrument
2020		800,000,000
Unsecured Debt \| Debt maturing in 2021
Debt Instrument
2021		700,000,000
Unsecured Debt \| Debt maturing in 2022
Debt Instrument
2022		900,000,000
Unsecured Debt \| Thereafter
Debt Instrument
Thereafter		3,600,000,000
2015 Term Loan
Debt Instrument
Term loan		223,000,000	£ 169
Revolving Credit Facility \| Bank Line of Credit
Debt Instrument
Debt denominated in foreign currency outstanding		$ 112,000,000	£ 85
Weighted-average interest rate (as a percent)		3.09%	3.09%