SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Investment in Direct Financing Lease (Details) - Skilled Nursing Transitional Care Facilities $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($) Property	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Property	Jun. 30, 2018 USD ($)
Lessor, Lease, Description [Line Items]
Net investment in direct financing lease	$ 23.6		$ 23.6
Number of properties in direct financing lease \| Property	1		1
Undiscounted rental payments	$ 4.8		$ 4.8
Unguaranteed residual value	24.7		24.7
Unearned lease income	5.9		5.9
Lease income	0.7	$ 0.6	1.3	$ 1.3
Minimum lease payments contractually due under direct financing leases
Due in the remainder of 2019	1.1		1.1
Due in 2020	2.3		2.3
Due in 2021	$ 2.1		$ 2.1

Lessor, Direct Financing Lease, Number of Properties

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Amount of deferred selling profit from direct financing lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919379-209981

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Amount of lease income from variable lease payments, interest income on direct financing lease and after offset of loss recognized at commencement.

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Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term, guaranteed by lessee or other third party unrelated to lessor, from direct financing lease.

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Amount of net investment in direct financing lease.

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Present value expected to be derived from underlying asset, following end of lease term, not guaranteed by lessee or other third party unrelated to lessor.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in remainder of the fiscal year following latest fiscal year. Excludes interim and annual period when interim periods are reported on a rolling approach, from latest statement of financial position date.

+ References

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Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in third fiscal year following latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest statement of financial position date.

+ References

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Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in second fiscal year following latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest statement of financial position date.

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