IMPAIRMENT OF REAL ESTATE AND DISPOSITIONS - Dispositions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) facility	Dec. 31, 2021 USD ($) facility	Dec. 31, 2020 USD ($) facility
Dispositions:
Number of facilities | facility	18	16	8
Consideration, net of closing costs	$ 87.3	$ 103.4	$ 50.0
Net carrying value	99.3	92.1	47.1
Net (loss) gain on sale	(12.0)	11.3	2.9
Net income (loss)	(21.8)	15.4	12.1
Impairment upon disposal	$ 14.8	$ 9.5	$ 4.0
Disposal group, not discontinued operations, gain (loss) on disposal, statement of income	Net (loss) gain on sale