Capital Stock - Class A and B Common Stock (Details) |
12 Months Ended | ||
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Dec. 31, 2020
classOfStock
shares
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Dec. 31, 2019
shares
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Dec. 31, 2018
shares
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Common stock | |||
Number of classes of common stock | classOfStock | 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 | 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 | 0.67% | ||
Ratio for converting shares of Class B common stock into shares of Class A common stock | 2,400 | 2,400 | |
Class B common stock shares converted into Class A common stock shares (in shares) | shares | 0 | 0 | 0 |