Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 536,430	$ 468,445	$ 1,503,389	$ 1,363,900
Detection
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	233,935	191,188	616,154	546,094
Fire Service
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	173,214	158,654	494,378	472,576
Industrial PPE And Other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 129,281	$ 118,603	$ 392,857	$ 345,230
Revenue Benchmark | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark | Detection | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	44.00%	41.00%	41.00%	40.00%
Revenue Benchmark | Fire Service | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	32.00%	34.00%	33.00%	35.00%
Revenue Benchmark | Industrial PPE And Other | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	24.00%	25.00%	26.00%	25.00%
Americas segment
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 338,246	$ 313,350	$ 1,004,935	$ 926,649
Americas segment | Detection
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	130,107	124,111	392,710	361,176
Americas segment | Fire Service
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	119,179	109,497	343,514	326,220
Americas segment | Industrial PPE And Other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 88,960	$ 79,742	$ 268,711	$ 239,253
Americas segment | Revenue Benchmark | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas segment | Revenue Benchmark | Detection | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	38.00%	40.00%	39.00%	39.00%
Americas segment | Revenue Benchmark | Fire Service | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	35.00%	35.00%	34.00%	35.00%
Americas segment | Revenue Benchmark | Industrial PPE And Other | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	27.00%	25.00%	27.00%	26.00%
International segment
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 198,184	$ 155,095	$ 498,454	$ 437,251
International segment | Detection
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	103,828	67,077	223,444	184,918
International segment | Fire Service
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	54,035	49,157	150,864	146,356
International segment | Industrial PPE And Other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 40,321	$ 38,861	$ 124,146	$ 105,977
International segment | Revenue Benchmark | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
International segment | Revenue Benchmark | Detection | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	52.00%	43.00%	45.00%	42.00%
International segment | Revenue Benchmark | Fire Service | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	27.00%	32.00%	30.00%	33.00%
International segment | Revenue Benchmark | Industrial PPE And Other | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	21.00%	25.00%	25.00%	25.00%