RESTRUCTURING COSTS - Restructuring Costs Recorded In Consolidated Statements Of Operations And Comprehensive Loss (Details) - General and administrative - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	$ 18.6	$ 0.0	$ 0.0
Employee costs
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	15.5	0.0	0.0
Real estate exit costs
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	2.1	0.0	0.0
Software costs
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	$ 1.0	$ 0.0	$ 0.0