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Equity - Exchangeable Shares and Preferred Stock (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 shares | Sep. 30, 2019 Acquisition shares | Dec. 31, 2018 shares | Oct. 05, 2017 shares
Class of Stock [Line Items] |  |  |  |
Number of shares of common stock received for each exchangeable share (in shares) |  | 1 |  |
Number of business acquisitions having issuances of preferred stock | Acquisition |  | 2 |  |
Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 1
Series G Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares issued (in shares) |  | 0 | 1 | 1
Exchangeable Shares For Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Exchangeable shares exchanged for common stock (in shares) | 400,000 |  |  |
Exchangeable Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) |  | 36,183 | 486,112 |

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