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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The following table summarizes the carrying amount of goodwill and changes in the carrying amount of goodwill, by segment:
(in millions of dollars) | Environmental Solutions |  | Safety & Security Systems |  | Total
Balance at December 31, 2022 | $ | 343.8 |  |  | $ | 109.6 |  |  | $ | 453.4 |
Acquisitions, including measurement period adjustments | 17.8 |  |  | — |  |  | 17.8 |
Translation adjustments | 0.3 |  |  | 1.2 |  |  | 1.5 |
Balance at December 31, 2023 | 361.9 |  |  | 110.8 |  |  | 472.7 |
Acquisitions, including measurement period adjustments | 8.0 |  |  | — |  |  | 8.0 |
Translation adjustments | (1.1) |  |  | (1.9) |  |  | (3.0) |
Balance at December 31, 2024 | $ | 368.8 |  |  | $ | 108.9 |  |  | $ | 477.7 |
Schedule of Finite-Lived Intangible Assets | The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:
| 2024 |  | 2023
(in millions of dollars) | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships (a) | $ | 165.7 |  |  | $ | (80.7) |  |  | $ | 85.0 |  |  | $ | 161.6 |  |  | $ | (66.3) |  |  | $ | 95.3 |
Other (a) | 7.2 |  |  | (4.9) |  |  | 2.3 |  |  | 8.1 |  |  | (4.4) |  |  | 3.7 |
Total definite-lived intangible assets | 172.9 |  |  | (85.6) |  |  | 87.3 |  |  | 169.7 |  |  | (70.7) |  |  | 99.0 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 108.1 |  |  | — |  |  | 108.1 |  |  | 104.2 |  |  | — |  |  | 104.2 |
Other | 4.3 |  |  | — |  |  | 4.3 |  |  | 4.3 |  |  | — |  |  | 4.3 |
Total indefinite-lived intangible assets | 112.4 |  |  | — |  |  | 112.4 |  |  | 108.5 |  |  | — |  |  | 108.5 |
Total intangible assets | $ | 285.3 |  |  | $ | (85.6) |  |  | $ | 199.7 |  |  | $ | 278.2 |  |  | $ | (70.7) |  |  | $ | 207.5 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 11 years and 6 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 11 years.
Schedule of Indefinite-Lived Intangible Assets | The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:
| 2024 |  | 2023
(in millions of dollars) | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships (a) | $ | 165.7 |  |  | $ | (80.7) |  |  | $ | 85.0 |  |  | $ | 161.6 |  |  | $ | (66.3) |  |  | $ | 95.3 |
Other (a) | 7.2 |  |  | (4.9) |  |  | 2.3 |  |  | 8.1 |  |  | (4.4) |  |  | 3.7 |
Total definite-lived intangible assets | 172.9 |  |  | (85.6) |  |  | 87.3 |  |  | 169.7 |  |  | (70.7) |  |  | 99.0 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 108.1 |  |  | — |  |  | 108.1 |  |  | 104.2 |  |  | — |  |  | 104.2 |
Other | 4.3 |  |  | — |  |  | 4.3 |  |  | 4.3 |  |  | — |  |  | 4.3 |
Total indefinite-lived intangible assets | 112.4 |  |  | — |  |  | 112.4 |  |  | 108.5 |  |  | — |  |  | 108.5 |
Total intangible assets | $ | 285.3 |  |  | $ | (85.6) |  |  | $ | 199.7 |  |  | $ | 278.2 |  |  | $ | (70.7) |  |  | $ | 207.5 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 11 years and 6 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 11 years.

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