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LOSS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net loss $ (178.6) $ (38.9) $ (278.2) $ (144.5)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares) 248.9 37.9 248.0 38.6
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares) 248.9 37.9 248.0 38.6
Loss per common share: basic (both Class A and B) (in dollars per share) $ (0.72) $ (1.03) $ (1.12) $ (3.74)
Loss per common share: diluted (both Class A and B) (in dollars per share) $ (0.72) $ (1.03) $ (1.12) $ (3.74)