XML 63 R50.htm IDEA: XBRL DOCUMENT v3.21.1
SHARE-BASED COMPENSATION - Option Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Number of Shares    
Outstanding, beginning balance (in shares) 10.4  
Granted (in shares) 0.0  
Exercised (in shares) (1.2)  
Forfeited, expired or canceled (in shares) (0.7)  
Outstanding, ending balance (in shares) 8.5 10.4
Weighted-Average Exercise Price    
Outstanding, beginning balance, weighted-average exercise price (in dollars per share) $ 2.39  
Granted, weighted-average exercise price (in dollars per share) 0  
Exercised, weighted-average exercise price (in dollars per share) 2.00  
Forfeited, expired and canceled, weighted-average exercise price (in dollars per share) 4.80  
Outstanding, ending balance, weighted-average exercise price (in dollars per share) $ 2.24 $ 2.39
Outstanding, weighted-average remaining contractual term (in years) 7 years 2 months 1 day 7 years 9 months
Exercisable, weighted-average remaining contractual term (in years) 7 years 2 months 1 day 7 years 9 months
Outstanding, aggregate intrinsic value $ 88.5 $ 137.7
Exercised, aggregate intrinsic value 12.1  
Exercisable, aggregate intrinsic value $ 88.5 $ 137.7