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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Common Shares and Units - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | May 10, 2017 | May 09, 2017
Class of Stock [Line Items] |  |  |  |
Common shares, authorized (in shares) | 200,000,000 | 200,000,000 | 200,000,000 | 100,000,000
Restricted shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Restricted stock, shares canceled for tax withholding for share based compensation (in shares) | 3,288 | 4,314 |  |
LTIP Units and Restricted Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Unit based compensation | $ 8.4 | $ 8.4 |  |

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