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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