RESTRUCTURING AND RELATED CHARGES - Narrative (Details) $ in Millions		1 Months Ended		3 Months Ended
	Aug. 05, 2022 position	Jan. 31, 2023 USD ($) position	Apr. 30, 2020 position	Mar. 31, 2023 USD ($) employee
600 West Chicago
Restructuring Cost and Reserve [Line Items]
Option to lease early termination penalty		$ 9.6
2022 Restructuring Plan, First Phase
Restructuring Cost and Reserve [Line Items]
Reduction in number of positions (in employees) \| position	1,000
2022 Restructuring Plan, First Phase \| Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost (up to)				$ 20.0
2022 Restructuring Plan, First Phase \| Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost (up to)				$ 27.0
2022 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Reduction in number of positions (in employees)		1,000		8
Restructuring and related charges, incurred to date				$ 18.6
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Reduction in number of positions (in employees) \| position			1,600
Restructuring and related charges, incurred to date				$ 109.2