IMPAIRMENT OF REAL ESTATE AND DISPOSITIONS - Dispositions (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) facility	Dec. 31, 2020 USD ($) facility	Dec. 31, 2019 USD ($) facility
Dispositions:
Number of facilities \| facility	16	8	46
Consideration, net of closing costs	$ 103.4	$ 50.0	$ 323.6
Net carrying value	92.1	47.1	321.3
Net gain on sale	11.3	2.9	2.3
Net income (loss)	16.0	5.9	(102.2)
Impairment upon disposal	$ 0.5	$ 4.0	$ 115.8

Disposal Group, Including Discontinued Operation, Assets And Liabilities, Net

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Disposal Group, Including Discontinued Operations, Number Of Properties

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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