Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue from External Customer [Line Items]
Revenues	$ 462,463	$ 447,299	$ 875,765	$ 845,561
Fire Service
Revenue from External Customer [Line Items]
Revenues	172,269	166,490	335,962	305,878
Detection
Revenue from External Customer [Line Items]
Revenues	170,848	158,242	310,064	304,843
Industrial PPE and Other
Revenue from External Customer [Line Items]
Revenues	$ 119,346	$ 122,567	$ 229,739	$ 234,840
Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark | Fire Service | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	37.00%	37.00%	39.00%	36.00%
Revenue Benchmark | Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	37.00%	35.00%	35.00%	36.00%
Revenue Benchmark | Industrial PPE and Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	26.00%	28.00%	26.00%	28.00%
Americas
Revenue from External Customer [Line Items]
Revenues	$ 314,711	$ 308,378	$ 610,249	$ 588,645
Americas | Fire Service
Revenue from External Customer [Line Items]
Revenues	118,487	121,157	240,738	223,213
Americas | Detection
Revenue from External Customer [Line Items]
Revenues	111,405	104,374	207,700	203,685
Americas | Industrial PPE and Other
Revenue from External Customer [Line Items]
Revenues	$ 84,819	$ 82,847	$ 161,811	$ 161,747
Americas | Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas | Revenue Benchmark | Fire Service | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	38.00%	39.00%	39.00%	38.00%
Americas | Revenue Benchmark | Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	35.00%	34.00%	34.00%	35.00%
Americas | Revenue Benchmark | Industrial PPE and Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	27.00%	27.00%	27.00%	27.00%
International
Revenue from External Customer [Line Items]
Revenues	$ 147,752	$ 138,921	$ 265,516	$ 256,916
International | Fire Service
Revenue from External Customer [Line Items]
Revenues	53,782	45,333	95,224	82,665
International | Detection
Revenue from External Customer [Line Items]
Revenues	59,443	53,868	102,364	101,158
International | Industrial PPE and Other
Revenue from External Customer [Line Items]
Revenues	$ 34,527	$ 39,720	$ 67,928	$ 73,093
International | Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
International | Revenue Benchmark | Fire Service | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	37.00%	33.00%	36.00%	32.00%
International | Revenue Benchmark | Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	40.00%	39.00%	38.00%	39.00%
International | Revenue Benchmark | Industrial PPE and Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	23.00%	28.00%	26.00%	29.00%