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Earnings Per Share - Narrative (Details) - Common Class A
shares in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Conversion ratio 1  
Employee stock option    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from diluted EPS calculation (in options)   6