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Equity - Exchangeable Shares and Preferred Stock (Details)
 12 Months Ended
Jan. 01, 2019
shares
Dec. 31, 2018
Acquisition
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Oct. 05, 2017
shares
Class of Stock [Line Items]          
Number of shares of Common stock received for each exchangeable share (in shares)   1      
Minimum number of shares that can be exchanged by exchangeable shareholders unless the number of remaining exchangeable shares registered in the name of the holder is less (in shares)   50,000      
Number of business acquisitions having issuances of preferred stock | Acquisition   2      
Series F          
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)   1 1    
Preferred stock, shares outstanding (in shares)   1 1    
Exchangeable Shares For Common Stock          
Class of Stock [Line Items]          
Exchangeable shares exchanged for common stock (in shares)     6,000,000.0 400,000  
Exchangeable Shares          
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares)   486,112 486,112    
Exchangeable Shares Associated with Series G Preferred Stock          
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares)   400,000      
Exchangeable Shares Associated with Series G Preferred Stock | Subsequent Event          
Class of Stock [Line Items]          
Exchangeable shares exchanged for common stock (in shares) 400,000