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Subsequent Events (Details) - Subsequent event - $ / shares
Jul. 27, 2020
Jul. 03, 2020
AVG    
Subsequent events    
Outstanding shares acquired (as a percent)   100.00%
Class A    
Subsequent events    
Quarterly dividend payable (in dollars per share) $ 0.23  
Class B    
Subsequent events    
Quarterly dividend payable (in dollars per share) $ 0.23