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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | GOODWILL AND OTHER INTANGIBLE ASSETS 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 |
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. The Company currently estimates that aggregate amortization expense will be approximately $15.9 million in 2025, $15.6 million in 2026, $14.7 million in 2027, $14.2 million in 2028, $8.8 million in 2029, and $18.1 million thereafter. Actual amounts of amortization may differ from estimated amounts due to additional intangible asset acquisitions, changes in foreign currency rates, measurement period adjustments for recent acquisitions, impairment of intangible assets, and other events.

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