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LOSS PER SHARE - Schedule of Basic and Diluted Loss per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Net loss $ (7.8) $ (36.7) $ (14.0) $ (77.6)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares) 14.9 14.4 14.8 14.3
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares) 14.9 14.4 14.8 14.3
Loss per common share: basic (both Class A and B) (in dollars per share) $ (0.52) $ (2.55) $ (0.95) $ (5.43)
Loss per common share: diluted (both Class A and B) (in dollars per share) $ (0.52) $ (2.55) $ (0.95) $ (5.43)