Net Revenues - Summary of Disaggregated Net Revenues (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,771	$ 1,649	$ 3,385	$ 3,120
United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,123	1,026	2,093	1,894
France [Member]
Disaggregation of Revenue [Line Items]
Net revenues	150	144	306	292
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	498	479	986	934
Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,225	1,146	2,416	2,220
Safety Services [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	583	534	1,143	1,008
Safety Services [Member] | France [Member]
Disaggregation of Revenue [Line Items]
Net revenues	150	144	306	292
Safety Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	492	468	967	920
Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	555	518	985	930
Specialty Services [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	549	507	966	916
Specialty Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	6	11	19	14
Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(9)	(15)	(16)	(30)
Corporate and Eliminations [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(9)	(15)	(16)	(30)
Life Safety [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,098	1,019	2,166	1,982
Life Safety [Member] | Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,098	1,019	2,166	1,982
Heating, Ventilation and Air Conditioning ("HVAC") [Member]
Disaggregation of Revenue [Line Items]
Net revenues	127	127	250	238
Heating, Ventilation and Air Conditioning ("HVAC") [Member] | Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	127	127	250	238
Infrastructure/Utility [Member]
Disaggregation of Revenue [Line Items]
Net revenues	307	292	547	508
Infrastructure/Utility [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	307	292	547	508
Fabrication [Member]
Disaggregation of Revenue [Line Items]
Net revenues	58	53	113	107
Fabrication [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	58	53	113	107
Specialty Contracting [Member]
Disaggregation of Revenue [Line Items]
Net revenues	190	173	325	315
Specialty Contracting [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	190	173	325	315
Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(9)	(15)	(16)	(30)
Corporate and Eliminations [Member] | Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ (9)	$ (15)	$ (16)	$ (30)