ACCOUNTING POLICIES - Redeemable OP Unitholder and Noncontrolling Interest (Details) shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)
Redeemable Noncontrolling Interest
Unit conversion factor for common stock	0.9051
Redeemable OP unitholder interest, fair value \| $	$ 100.8	$ 171.2
NHP/PMB L.P. \| Limited Partner \| Class A
Redeemable Noncontrolling Interest
Limited partners' units outstanding	3.3
NHP/PMB L.P. \| General Partner \| Class B
Redeemable Noncontrolling Interest
General partners' units outstanding	7.3
NHP/PMB L.P. \| Limited Partner \| Class A
Redeemable Noncontrolling Interest
Percentage of limited partner ownership interest on total units outstanding	31.00%
NHP/PMB L.P. \| General Partner \| Class B
Redeemable Noncontrolling Interest
Percentage of general partner ownership interest on total units outstanding	69.00%

The number of general partner units outstanding.

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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

+ Details

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- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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- Definition

Fair value of noncontrolling interests which are redeemable by the parent entity and classified as other equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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-Publisher FASB
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 14
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
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-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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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.

+ References

No definition available.

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- Definition

Unit conversion factor for common stock assigned at the time of the merger.

+ References

No definition available.

+ Details

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