NET REVENUES - Summary of Disaggregated Net Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Net revenues	$ 2,085	$ 1,826	$ 5,794	$ 5,157
Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	2,086	1,828	5,797	5,162
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(1)	(2)	(3)	(5)
United States
Disaggregation of Revenue [Line Items]
Net revenues	1,397	1,180	3,778	3,217
United States \| Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(1)	(2)	(3)	(5)
France
Disaggregation of Revenue [Line Items]
Net revenues	170	153	503	472
France \| Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Net revenues	518	493	1,513	1,468
Other \| Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Life Safety
Disaggregation of Revenue [Line Items]
Net revenues	1,403	1,216	4,032	3,509
Infrastructure/Utility
Disaggregation of Revenue [Line Items]
Net revenues	291	283	732	734
Fabrication and Distribution
Disaggregation of Revenue [Line Items]
Net revenues	103	82	272	206
Specialty Contracting
Disaggregation of Revenue [Line Items]
Net revenues	289	247	761	713
Corporate and Elimination
Disaggregation of Revenue [Line Items]
Net revenues	2,085	1,826	5,794	5,157
Safety Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	1,403	1,216	4,032	3,509
Safety Services \| United States \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	715	570	2,016	1,574
Safety Services \| France \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	170	153	503	472
Safety Services \| Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	518	493	1,513	1,463
Safety Services \| Life Safety \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	1,403	1,216	4,032	3,509
Safety Services \| Infrastructure/Utility \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Safety Services \| Fabrication and Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Safety Services \| Specialty Contracting \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Specialty Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	683	612	1,765	1,653
Specialty Services \| United States \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	683	612	1,765	1,648
Specialty Services \| France \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Specialty Services \| Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	5
Specialty Services \| Life Safety \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Specialty Services \| Infrastructure/Utility \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	291	283	732	734
Specialty Services \| Fabrication and Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	103	82	272	206
Specialty Services \| Specialty Contracting \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	$ 289	$ 247	$ 761	$ 713