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SHARE-BASED COMPENSATION - RSU Activity (Details) - Restricted stock unit expense
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 8.9
Granted (in shares) | shares 2.4
Vested (in shares) | shares (0.9)
Forfeited, expired or canceled (in shares) | shares (1.8)
Ending balance (in shares) | shares 8.6
Weighted-Average Grant Date Fair Value per Share  
Beginning balance, weighted-average grant date fair value (in dollars per shares) | $ / shares $ 9.02
Granted, weighted-average grant date fair value (in dollars per shares) | $ / shares 1.68
Vested, weighted-average grant date fair value (in dollars per shares) | $ / shares 10.48
Forfeited, expired or canceled, weighted-average grant date fair value (in dollars per share) | $ / shares 8.68
Ending balance, weighted-average grant date fair value (in dollars per shares) | $ / shares $ 6.29
Aggregate Intrinsic Value  
Beginning balance | $ $ 27.4
Vested | $ 2.0
Ending balance | $ $ 16.8