SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowances for Doubtful Accounts (Details) - USD ($) $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2023	Aug. 12, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 0.0	$ 34.5	$ 35.3	$ 37.5
Charged to costs and expenses	8.0	16.6	14.0	9.8
Charged to other accounts	(0.2)	(0.3)	(0.1)	0.0
Deductions	(4.2)	(14.7)	(14.7)	(12.0)
Fresh Start adjustment	0.0	(36.1)	0.0	0.0
Ending balance	$ 3.6	$ 0.0	$ 34.5	$ 35.3