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ACCOUNTING POLICIES - Redeemable OP Unitholder and Noncontrolling Interest (Details) shares in Millions, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
Redeemable Noncontrolling Interest |  |
Unit conversion factor for common stock | 0.9051 |
Redeemable OP unitholder interest, fair value | $ | $ 129.6 | $ 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% |

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