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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Common Shares and Units - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Restricted shares |  |  |
Class Of Stock [Line Items] |  |  |
Restricted stock, shares canceled for tax withholding for share based compensation (in shares) | 2,468 |  | 3,288
LTIP Units and Restricted Stock |  |  |
Class Of Stock [Line Items] |  |  |
Unit based compensation | $ 3.7 | $ 4.3 | $ 8.4

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