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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

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