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OPERATING PARTNERSHIP UNITS - Class M OP Units Conversion (Q2) (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 01, 2021 | Jun. 30, 2021 USD ($) $ / shares | Dec. 31, 2020 | Dec. 31, 2019 USD ($) $ / shares
Conversion of Stock [Line Items] |  |  |  |
Conversion ratio | 0.3333 |  |  |
Fiscal Year 2021 |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Early conversion ratio |  | 0.50 | 0.50 |
AUM conversion threshold | $ |  | $ 860 |  | $ 860
AFFO conversion threshold (in usd per share) | $ / shares |  | $ 1.77 |  | $ 1.77
Conversion ratio |  | 0.5217 | 0.5217 |
Fiscal Year 2022 |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Early conversion ratio |  | 0.60 | 0.60 |
AUM conversion threshold | $ |  | $ 1,175 |  | $ 1,175
AFFO conversion threshold (in usd per share) | $ / shares |  | $ 1.95 |  | $ 1.95
Conversion ratio |  | 0.4000 | 0.4000 |
Fiscal Year 2023 |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Early conversion ratio |  | 0.70 | 0.70 |
AUM conversion threshold | $ |  | $ 1,551 |  | $ 1,551
AFFO conversion threshold (in usd per share) | $ / shares |  | $ 2.10 |  | $ 2.10
Conversion ratio |  | 0.3333 | 0.3333 |
Initial Period |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Conversion ratio |  | 0.6000 | 0.6000 |

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