INCOME TAXES - Summary of Valuation Allowance For Deferred Tax Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Beginning Balance	$ 326.1	$ 264.1	$ 203.6
Additions	16.6	67.0	69.1
Deductions	83.0	5.3	4.3
Currency translation	(6.6)	(0.3)	4.3
Ending Balance	266.3	326.1	264.1
CUSA
Income Taxes [Line Items]
Beginning Balance	283.2	240.9	203.6
Additions	5.9	47.0	52.5
Deductions	77.2	4.9	10.9
Currency translation	(6.6)	(0.2)	4.3
Ending Balance	$ 218.5	$ 283.2	$ 240.9