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Segment Information (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Summary of Continuing Operations by Segment

The following tables summarize the Company’s financial performance by reportable segment and include reconciliations of segment operating income to consolidated income before income taxes:

			For the Year Ended December 31, 2024
(in millions of dollars)			Environmental Solutions						Safety and Security Systems						Total
Net sales (a)			$	1,557.1					$	304.4					$	1,861.5
Less: Cost of sales			1,152.0						176.5						1,328.5
Gross profit			405.1						127.9						533.0
Less:
Selling, engineering, general, and administrative expenses			127.5						63.5						191.0
Other segment items (b)			16.4						—						16.4
Segment operating income			261.2						64.4						325.6
Reconciliation to income before income taxes:
All other (income) loss (c)															44.2
Interest expense, net															12.5
Other expense, net															5.0
Income before income taxes															$	263.9

(a)    Represents net sales from external customers. Intersegment net sales are not significant. Total of segment net sales agrees to Net sales on the Consolidated Statement of Operations.

(b)    Other segment items includes amortization expense and acquisition and integration-related expenses, net, within the Environmental Solutions Group.

(c)    Represents general corporate expenses.

			For the Year Ended December 31, 2023
(in millions of dollars)			Environmental Solutions						Safety and Security Systems						Total
Net sales (a)			$	1,437.9					$	284.8					$	1,722.7
Less: Cost of sales			1,098.6						173.9						1,272.5
Gross profit			339.3						110.9						450.2
Less:
Selling, engineering, general, and administrative expenses			113.6						56.1						169.7
Other segment items (b)			16.5						—						16.5
Segment operating income			209.2						54.8						264.0
Reconciliation to income before income taxes:
All other (income) loss (c)															39.5
Interest expense, net															19.7
Other expense, net															1.8
Income before income taxes															$	203.0

(a)    Represents net sales from external customers. Intersegment net sales are not significant. Total of segment net sales agrees to Net sales on the Consolidated Statement of Operations.

(b)    Other segment items includes amortization expense and acquisition and integration-related expenses, net, within the Environmental Solutions Group.

(c)    Represents general corporate expenses.

			For the Year Ended December 31, 2022
(in millions of dollars)			Environmental Solutions						Safety and Security Systems						Total
Net sales (a)			$	1,190.6					$	244.2					$	1,434.8
Less: Cost of sales			936.3						153.6						1,089.9
Gross profit			254.3						90.6						344.9
Less:
Selling, engineering, general, and administrative expenses			96.8						49.8						146.6
Other segment items (b)			13.0						—						13.0
Segment operating income			144.5						40.8						185.3
Reconciliation to income before income taxes:
All other (income) loss (c)															24.5
Interest expense, net															10.3
Other income, net															(0.4)
Income before income taxes															$	150.9

(a)    Represents net sales from external customers. Intersegment net sales are not significant. Total of segment net sales agrees to Net sales on the Consolidated Statement of Operations.

(b)    Other segment items includes amortization expense and acquisition and integration-related expenses, net, within the Environmental Solutions Group.

(c)    Represents general corporate expenses.

Schedule of Depreciation and Amortization Expense by Segment

The following table summarizes the Company’s total depreciation and amortization by reportable segment and includes a reconciliation of total segment depreciation and amortization to total depreciation and amortization:

			For the Years Ended December 31,
(in millions of dollars)			2024						2023						2022
Depreciation and amortization:
Environmental Solutions (a)			$	60.9					$	56.0					$	50.3
Safety and Security Systems (a)			3.9						4.2						4.2
Total segment depreciation and amortization			64.8						60.2						54.5
Corporate			0.5						0.2						0.2
Total depreciation and amortization			$	65.3					$	60.4					$	54.7

(a)    The amounts of depreciation and amortization disclosed by reportable segment are included within cost of sales; selling, engineering, general, and administrative expenses; and other segment items in the tables above.

Reconciliation of Assets from Segment to Consolidated

The following table summarizes the Company’s total assets by reportable segment and includes a reconciliation of total segment assets to total assets:

			For the Years Ended December 31,
(in millions of dollars)			2024						2023						2022
Total assets:
Environmental Solutions			$	1,424.7					$	1,290.9					$	1,206.4
Safety and Security Systems			279.5						288.1						279.3
Total segment assets			1,704.2						1,579.0						1,485.7
Corporate and eliminations			61.0						41.5						38.6
Total assets			$	1,765.2					$	1,620.5					$	1,524.3

Schedule of Capital Expenditures by Segment

The following table summarizes the Company’s total capital expenditures by reportable segment and includes a reconciliation of total segment capital expenditures to total capital expenditures:

			For the Years Ended December 31,
(in millions of dollars)			2024						2023						2022
Capital expenditures
Environmental Solutions			$	31.6					$	23.0					$	19.4
Safety and Security Systems			6.1						5.2						32.4
Total segment capital expenditures			37.7						28.2						51.8
Corporate			2.9						2.1						1.2
Total capital expenditures			$	40.6					$	30.3					$	53.0

Schedule Of Segment Reporting Information By Geographical Segment Table

The following table summarizes net sales by geographic region based on the location of the end-customer:

			For the Years Ended December 31,
(in millions of dollars)			2024						2023						2022
Net sales:
U.S.			$	1,469.1					$	1,337.4					$	1,149.8
Canada			257.4						237.8						175.3
Europe/Other			135.0						147.5						109.7
Total net sales			$	1,861.5					$	1,722.7					$	1,434.8

Net sales exported from the U.S. aggregated to $131.4 million in 2024, $136.0 million in 2023, and $88.8 million in 2022.

The following table summarizes long-lived assets by geographic region based on the location of the Company’s subsidiaries:

			For the Years Ended December 31,
(in millions of dollars)			2024						2023						2022
Long-lived assets (a):
U.S.			$	318.1					$	261.6					$	249.4
Canada			97.4						80.7						59.1
Europe/Other			4.4						4.3						4.6
Total long-lived assets			$	419.9					$	346.6					$	313.1

(a)    Long-lived assets are comprised of properties and equipment, net, rental equipment, net, and operating lease right-of-use assets.

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