Net Revenues - Summary of Disaggregated Net Revenues (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,614	$ 1,471
United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	970	868
France [Member]
Disaggregation of Revenue [Line Items]
Net revenues	156	148
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	488	455
Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,191	1,074
Safety Services [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	560	474
Safety Services [Member] | France [Member]
Disaggregation of Revenue [Line Items]
Net revenues	156	148
Safety Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	475	452
Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	430	412
Specialty Services [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	417	409
Specialty Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	13	3
Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(7)	(15)
Corporate and Eliminations [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(7)	(15)
Life Safety [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,068	963
Life Safety [Member] | Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,068	963
Heating, Ventilation and Air Conditioning ("HVAC") [Member]
Disaggregation of Revenue [Line Items]
Net revenues	123	111
Heating, Ventilation and Air Conditioning ("HVAC") [Member] | Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	123	111
Infrastructure/Utility [Member]
Disaggregation of Revenue [Line Items]
Net revenues	240	142
Infrastructure/Utility [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	240	142
Fabrication [Member]
Disaggregation of Revenue [Line Items]
Net revenues	55	54
Fabrication [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	55	54
Specialty Contracting [Member]
Disaggregation of Revenue [Line Items]
Net revenues	135	216
Specialty Contracting [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	135	216
Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(7)	(15)
Corporate and Eliminations [Member] | Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ (7)	$ (15)