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RESTRUCTURING COSTS - Restructuring Costs Recorded In Consolidated Statements Of Operations And Comprehensive Loss (Details) - General and administrative - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 30 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]          
Total restructuring costs $ 0.0 $ 1.9 $ 0.1 $ 7.5 $ 29.9
Employee costs          
Restructuring Cost and Reserve [Line Items]          
Total restructuring costs 0.0 1.8 0.1 4.1 23.3
Real estate exit costs          
Restructuring Cost and Reserve [Line Items]          
Total restructuring costs 0.0 0.0 0.0 0.0 2.1
Other costs          
Restructuring Cost and Reserve [Line Items]          
Total restructuring costs $ 0.0 $ 0.1 $ 0.0 $ 3.4 $ 4.5