ACQUISITIONS OF REAL ESTATE PROPERTY (Narrative) (Details) $ in Millions	Nov. 05, 2021 USD ($) property	Sep. 21, 2021 USD ($) shares
New Senior Investment Group Inc. Acquisition
Business Acquisition [Line Items]
Value of assets acquired		$ 2,400.0
Number of shares issued in transaction | shares		13,300,000
Number of shares issued for each acquiree share | shares		0.1561
Mortgage debt assumed in transaction		$ 482.5
Cash paid for transaction at closing		1,100.0
Asset Acquisition, Price of Acquisition		$ 2,300.0
Canadian Senior Housing Community Acquisition | Subsequent Event
Business Acquisition [Line Items]
Value of assets acquired	$ 180.0
Number of properties acquired | property	6
Behavioral Health Center Acquisition | Subsequent Event
Business Acquisition [Line Items]
Value of assets acquired	$ 58.0