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Segment Information (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

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 three months ended September 30, 2025 and 2024:

			Three Months ended September 30, 2025
(in millions of dollars)			Environmental Solutions						Safety and Security Systems						Total
Net sales (a)			$	465.5					$	89.5					$	555.0
Less: Cost of sales			343.0						50.5						393.5
Gross profit			122.5						39.0						161.5
Less:
Selling, engineering, general, and administrative expenses			32.5						17.1						49.6
Other segment items (b)			4.7						—						4.7
Segment operating income			85.3						21.9						107.2
Reconciliation to income before income taxes:
All other (income) loss (c)															13.2
Interest expense, net															2.8
Other expense, net															0.7
Income before income taxes															$	90.5

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

			Three Months Ended September 30, 2024
(in millions of dollars)			Environmental Solutions						Safety and Security Systems						Total
Net sales (a)			$	398.2					$	76.0					$	474.2
Less: Cost of sales			290.4						43.4						333.8
Gross profit			107.8						32.6						140.4
Less:
Selling, engineering, general, and administrative expenses			32.2						15.8						48.0
Other segment items (b)			4.1						—						4.1
Segment operating income			71.5						16.8						88.3
Reconciliation to income before income taxes:
All other (income) loss (c)															12.4
Interest expense, net															3.0
Other expense, net															0.3
Income before income taxes															$	72.6

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

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 nine months ended September 30, 2025 and 2024:

			Nine Months Ended September 30, 2025
(in millions of dollars)			Environmental Solutions						Safety and Security Systems						Total
Net sales (a)			$	1,333.4					$	250.0					$	1,583.4
Less: Cost of sales			979.9						141.6						1,121.5
Gross profit			353.5						108.4						461.9
Less:
Selling, engineering, general, and administrative expenses			102.9						49.2						152.1
Other segment items (b)			13.7						—						13.7
Segment operating income			236.9						59.2						296.1
Reconciliation to income before income taxes:
All other (income) loss (c)															38.7
Interest expense, net															9.3
Other expense, net															2.2
Income before income taxes															$	245.9

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

			Nine Months Ended September 30, 2024
(in millions of dollars)			Environmental Solutions						Safety and Security Systems						Total
Net sales (a)			$	1,161.0					$	228.5					$	1,389.5
Less: Cost of sales			857.0						132.1						989.1
Gross profit			304.0						96.4						400.4
Less:
Selling, engineering, general, and administrative expenses			95.3						47.5						142.8
Other segment items (b)			12.6						—						12.6
Segment operating income			196.1						48.9						245.0
Reconciliation to income before income taxes:
All other (income) loss (c)															33.7
Interest expense, net															9.4
Other expense, net															0.9
Income before income taxes															$	201.0

(a)    Represents net sales from external customers. Intersegment net sales are not significant. Total of segment net sales agrees to Net sales on the Condensed 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 three and nine months ended September 30, 2025 and 2024:

			Three Months Ended September 30,												Nine Months Ended September 30,
(in millions of dollars)			2025						2024						2025						2024
Depreciation and amortization:
Environmental Solutions (a)			$	19.1					$	15.4					$	55.4					$	44.4
Safety and Security Systems (a)			1.0						1.0						3.1						3.0
Total segment depreciation and amortization			20.1						16.4						58.5						47.4
Corporate			0.2						0.1						0.4						0.3
Total depreciation and amortization			$	20.3					$	16.5					$	58.9					$	47.7

(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 as of September 30, 2025 and December 31, 2024:

(in millions of dollars)			September 30, 2025						December 31, 2024
Total assets:
Environmental Solutions			$	1,595.1					$	1,424.7
Safety and Security Systems			301.3						279.5
Total segment assets			1,896.4						1,704.2
Corporate and eliminations			42.0						61.0
Total assets			$	1,938.4					$	1,765.2

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 three and nine months ended September 30, 2025 and 2024:

			Three Months Ended September 30,												Nine Months Ended September 30,
(in millions of dollars)			2025						2024						2025						2024
Capital expenditures
Environmental Solutions			$	5.7					$	5.6					$	15.0					$	24.8
Safety and Security Systems			1.2						1.2						3.6						4.7
Total segment capital expenditures			6.9						6.8						18.6						29.5
Corporate			0.1						1.1						1.3						2.6
Total capital expenditures			$	7.0					$	7.9					$	19.9					$	32.1

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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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