ACQUISITION OF REAL ESTATE PROPERTY - 2021 Acquisitions (Details) $ in Millions		12 Months Ended
	Sep. 21, 2021 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) property
Business Acquisition [Line Items]
Value of assets acquired		$ 453.2
New Senior Investment Group Inc. Acquisition
Business Acquisition [Line Items]
Payments for asset acquisitions	$ 2,300.0
Value of assets acquired	$ 2,400.0
Number of shares issued in transaction (in shares) | 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
New Senior Investment Group Inc. Acquisition | SHOP
Business Acquisition [Line Items]
Number of real estate properties acquired | property			102
New Senior Investment Group Inc. Acquisition | Triple-net leased properties
Business Acquisition [Line Items]
Number of real estate properties acquired | property			1
Canadian Senior Housing Community And Behavior Health Center Acquisition
Business Acquisition [Line Items]
Value of assets acquired			$ 240.7
Number of real estate properties acquired | property			6