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DESCRIPTION OF BUSINESS - COVID-19 Update (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Nov. 03, 2020	Dec. 31, 2019
Unusual or Infrequent Item, or Both [Line Items]
Impairment of real estate	$ 129,500,000		$ 22,600,000
Allowance on loans receivable and investments	4,999,000		34,654,000
Commercial paper	$ 0		0		$ 567,450,000
Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Commercial paper				$ 0
COVID-19 Impact
Unusual or Infrequent Item, or Both [Line Items]
Impairment of real estate		$ 108,800,000
Impairment of real estate, percent of total	1.00%
Allowance on loans receivable and investments	$ 5,000,000.0		34,700,000
Impairment on equity investment		10,700,000
Deferred tax assets, valuation allowance		56,400,000
Allowance for Loan and Lease Losses, Write-offs	20,300,000		74,500,000
Funds applied for under the Provider Relief Fund of the CARES ACT	35,000,000
COVID-19 Impact \| Fair Value
Unusual or Infrequent Item, or Both [Line Items]
Real estate investments		$ 192,800,000
COVID-19 Impact \| Non-Mortgage Loans Receivable, Net
Unusual or Infrequent Item, or Both [Line Items]
Allowance on loans receivable and investments			(29,500,000)
COVID-19 Impact \| Government-sponsored pooled loan investments, net
Unusual or Infrequent Item, or Both [Line Items]
Allowance on loans receivable and investments			(8,800,000)
Revolving Credit Facility \| Unsecured revolving credit facility (1)
Unusual or Infrequent Item, or Both [Line Items]
Line of credit, remaining availability less commercial paper	2,900,000,000		2,900,000,000
Revolving Credit Facility \| Unsecured revolving credit facility (1) \| Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Line of credit, remaining availability less commercial paper				$ 3,200,000,000
Revolving Credit Facility \| Unsecured revolving credit facility (1) \| COVID-19 Impact
Unusual or Infrequent Item, or Both [Line Items]
Maximum borrowing capacity	$ 3,000,000,000.0		$ 3,000,000,000.0
Office Operations
Unusual or Infrequent Item, or Both [Line Items]
Lease, percent collected	99.00%