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INCOME TAXES - Schedule of Loss Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income (loss) before income taxes:      
United States $ (263.2) $ (141.3) $ (53.8)
Foreign 1.0 0.7 (3.3)
Loss before income tax $ (262.2) $ (140.6) $ (57.1)