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Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |
Conversion of common units to common shares (in units/shares) |  |  | 5,500 | 53,817
Dividends declared per share (in usd per share) | $ 0.275 | $ 0.275 | $ 0.55 | $ 0.55
Common Shares | Forward Equity Sale Agreement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares issued |  |  | 1,600,000 |
Proceeds from common shares issued under forward equity sale agreements |  |  | $ 46.5 |
Common Shares | 2018 Common Stock Issued to Public Under At-the-Market Program |  |  |  |
Class of Stock [Line Items] |  |  |  |
Aggregate gross sales price | $ 300.0 |  | $ 300.0 |
Corporate Office Properties, L.P. |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends declared per share (in usd per share) | $ 0.275 | $ 0.275 | $ 0.55 | $ 0.55

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