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Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Class of Stock [Line Items] |  |  |
Conversion of common units to common shares (in units/shares) |  | 12,009 | 5,500
Dividends declared per share (in usd per share) |  | $ 0.275 | $ 0.275
Common Shares | 2018 Common Stock Issued to Public Under At-the-Market Program |  |  |
Class of Stock [Line Items] |  |  |
At the market, offering program established, aggregate value | $ 300 |  |
Corporate Office Properties, L.P. |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per share (in usd per share) |  | $ 0.275 | $ 0.275

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