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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		9 Months Ended
Debt - Mortgage Debt (Details) £ in Millions	Nov. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) facility	Sep. 30, 2018 GBP (£) facility	Dec. 31, 2017 USD ($)
Debt Instrument
Total debt before discount, net			$ 6,744,490,000
(Discounts), premiums and debt costs, net			(38,731,000)
Debt instruments, carrying amount			6,705,759,000
Term loan			223,468,000		$ 228,288,000
Other debt			92,494,000		$ 94,165,000
Debt maturing in 2018
Debt Instrument
2018 (three months)			860,000
Debt maturing in 2019
Debt Instrument
2019			677,148,000
Debt maturing in 2020
Debt Instrument
2020			803,609,000
Debt maturing in 2021
Debt Instrument
2021			647,666,000
Debt maturing in 2022
Debt Instrument
2022			902,691,000
Thereafter
Debt Instrument
Thereafter			3,712,516,000
Bank Line of Credit
Debt Instrument
Total debt before discount, net			636,709,000
(Discounts), premiums and debt costs, net			0
Debt instruments, carrying amount			636,709,000
Bank Line of Credit \| Debt maturing in 2018
Debt Instrument
2018 (three 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			636,709,000
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			223,587,000
(Discounts), premiums and debt costs, net			(119,000)
Debt instruments, carrying amount			$ 223,468,000
Weighted-average interest rate (as a percent)			4.03%	4.03%
Weighted-average maturity			5 years
Term loans \| Minimum
Debt Instrument
Percentage of stated interest rate			2.79%	2.79%
Term loans \| Maximum
Debt Instrument
Percentage of stated interest rate			6.88%	6.88%
Term loans \| Debt maturing in 2018
Debt Instrument
2018 (three months)			$ 0
Term loans \| Debt maturing in 2019
Debt Instrument
2019			223,587,000
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
Senior Unsecured Note
Debt Instrument
Total debt before discount, net			5,750,000,000
(Discounts), premiums and debt costs, net			(43,819,000)
Debt instruments, carrying amount			5,706,181,000
Senior Unsecured Note \| Debt maturing in 2018
Debt Instrument
2018 (three months)			0
Senior Unsecured Note \| Debt maturing in 2019
Debt Instrument
2019			450,000,000
Senior Unsecured Note \| Debt maturing in 2020
Debt Instrument
2020			800,000,000
Senior Unsecured Note \| Debt maturing in 2021
Debt Instrument
2021			0
Senior Unsecured Note \| Debt maturing in 2022
Debt Instrument
2022			900,000,000
Senior Unsecured Note \| Thereafter
Debt Instrument
Thereafter			$ 3,600,000,000
Mortgage Debt
Debt Instrument
Number of healthcare facilities used to secure debt \| facility			15	15
Debt instrument, collateral, healthcare facilities carrying value			$ 280,000,000
Repayments of debt		$ 472,000,000
Total debt before discount, net			134,194,000
(Discounts), premiums and debt costs, net			5,207,000
Debt instruments, carrying amount			$ 139,401,000
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			2.65%	2.65%
Mortgage Debt \| Maximum
Debt Instrument
Percentage of stated interest rate			5.91%	5.91%
Mortgage Debt \| Debt maturing in 2018
Debt Instrument
2018 (three months)			$ 860,000
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
Revolving Credit Facility \| Bank Line of Credit
Debt Instrument
Debt denominated in foreign currency outstanding			$ 72,000,000	£ 55
Weighted-average interest rate (as a percent)			3.33%	3.33%
Forecast \| Senior Unsecured Note
Debt Instrument
Percentage of stated interest rate	3.75%
Gross amount of debt redemption	$ 450,000,000