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Segment Information (Tables) | 9 Months Ended
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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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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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