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Stock-Based Compensation - Restricted Stock Units Activity (Details) - RSUs - $ / shares
shares in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2020
Jun. 30, 2019
RSUs, Number of shares        
RSUs unvested and outstanding, beginning (shares)   3.2    
RSUs granted (shares)   1.8    
RSUs vested (shares)   (1.1)    
RSUs canceled (shares)   (0.8)    
RSUs unvested and outstanding, ending (shares) 3.2 3.1    
RSUs, Weighted average grant date fair value        
RSUs unvested and outstanding, beginning (dollars per share)   $ 20.56    
RSUs granted (dollars per share) $ 13.69 29.83 $ 27.96 $ 46.62
RSUs vested (dollars per share)   21.32    
RSUs canceled (dollars per share)   24.48    
RSUs unvested and outstanding, ending (dollars per share) $ 20.56 $ 24.96