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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