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Earnings Per Share - Narrative (Details)
9 Months Ended
Sep. 30, 2021
class_of_stock
shares
Sep. 30, 2020
shares
Dec. 31, 2020
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of classes of common stock | class_of_stock 2    
Common stock, outstanding (in shares)     0
Class B Non-Voting Common Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Common stock, outstanding (in shares) 0   0
Restricted Stock Units (RSUs)      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of shares excluded related to restricted stock units 1,083,635 1,032,305