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Capital Stock - Class A and B Common Stock (Details)
12 Months Ended
Dec. 31, 2019
class
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Common stock      
Number of classes of common stock | class 2    
Class A Common Stock      
Common stock      
Minimum multiplier for dividend payable on Class A common stock per dividend declared on Class B common stock (as a percent) 0.67%    
Class B Common Stock      
Common stock      
Percentage of dividend declared on Class B common stock used to determine dividend payable on Class A common stock (as a percent) 0.67%    
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent) 2400.00% 2400.00%  
Class B common stock shares converted into Class A common stock shares (in shares) | shares 0 0 0