Annual report pursuant to Section 13 and 15(d)

Equity and Earnings Per Share (Details) - Additional Information

v3.20.4
Equity and Earnings Per Share (Details) - Additional Information
Dec. 31, 2020
vote
shares
Class A Common Stock  
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]  
Number of votes per share 1
Class B Common Stock  
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]  
Number of votes per share 5
Common stock, conversion basis (in shares) | shares 1