SEGMENT INFORMATION - Summary of Reconciliation Operating Income to EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net revenues	$ 1,826	$ 1,784	$ 5,157	$ 5,169
EBITDA Reconciliation
Operating income (loss)	142	104	368	284
Plus:
Investment (expense) income and other, net	(1)	7	(6)	18
Loss on extinguishment of debt, net	0	0	0	(3)
Depreciation	21	21	60	59
Amortization	56	56	161	167
EBITDA	218	188	583	525
Total assets	8,245	7,949	8,245	7,949	$ 7,590
Capital expenditures	22	18	66	64
Corporate and Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net revenues	(2)	(2)	(6)	(18)
EBITDA Reconciliation
Operating income (loss)	(46)	(37)	(126)	(92)
Plus:
Investment (expense) income and other, net	(1)	1	(1)	1
Loss on extinguishment of debt, net				(3)
Depreciation	1	0	3	1
Amortization	1	1	2	3
EBITDA	(45)	(35)	(122)	(90)
Total assets	472	651	472	651
Capital expenditures	2	3	12	4
Safety Services | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net revenues	1,335	1,217	3,828	3,633
EBITDA Reconciliation
Operating income (loss)	148	98	412	292
Plus:
Investment (expense) income and other, net	(2)	5	(12)	11
Loss on extinguishment of debt, net				0
Depreciation	9	8	24	21
Amortization	42	42	120	125
EBITDA	197	153	544	449
Total assets	6,605	5,983	6,605	5,983
Capital expenditures	8	5	19	19
Specialty Services | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net revenues	493	569	1,335	1,554
EBITDA Reconciliation
Operating income (loss)	40	43	82	84
Plus:
Investment (expense) income and other, net	2	1	7	6
Loss on extinguishment of debt, net				0
Depreciation	11	13	33	37
Amortization	13	13	39	39
EBITDA	66	70	161	166
Total assets	1,168	1,315	1,168	1,315
Capital expenditures	$ 12	$ 10	$ 35	$ 41