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Earnings Per Common Share - Narrative (Details) - shares
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Dilutive potential common shares - forward equity agreements (in shares)     808,000 1,093,000  
Dilutive potential common shares - DownREIT conversions (in shares)     7,443,000 0  
Down REIT          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares)       6,000,000  
Employee stock option          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares)     1,000,000 1,000,000  
Convertible Units          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares)     31,000,000 18,000,000  
2019 ATM Program          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Maximum shares issuable under forward equity sales agreement (in shares)     2,000,000.0 3,600,000  
Forward Equity Offering          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Maximum shares issuable under forward equity sales agreement (in shares)   15,300,000      
Option indexed to issuers equity, term   1 year 1 year    
Share settlement (in shares)       0 15,300,000
Issuance of common stock, net (in shares)   0      
2019 ATM Program, Settled          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Share settlement (in shares)     16,800,000 0  
Remainder outstanding (in shares)     0    
2019 Forward Equity Offering          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Maximum shares issuable under forward equity sales agreement (in shares) 15,600,000        
Share settlement (in shares)     15,600,000    
Issuance of common stock, net (in shares)     0   0