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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