DEBT - Lines of Credit and Other Debt Facilities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Revolving Credit Facility
Debt Instrument
Reduction in borrowings	$ 5.8	$ 6.2
Line of Credit
Debt Instrument
Outstanding letters of credit	5.8	6.2
Lines of Credit and Revolving Lines of Credit | Line of Credit
Debt Instrument
Remaining borrowing capacity	$ 392.0	$ 392.0