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Goodwill and Other Intangibles Assets | 9 Months Ended
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Sep. 30, 2025
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 the changes in the carrying amount of goodwill in the nine months ended September 30, 2025, by segment:
(in millions) | Environmental Solutions |  | Safety & Security Systems |  | Total
Balance at January 1, 2025 | $ | 368.8 |  |  | $ | 108.9 |  |  | $ | 477.7 |
Acquisitions, including measurement period adjustments | 40.1 |  |  | — |  |  | 40.1 |
Translation adjustments | — |  |  | 3.9 |  |  | 3.9 |
Balance at September 30, 2025 | $ | 408.9 |  |  | $ | 112.8 |  |  | $ | 521.7 |
The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:
| September 30, 2025 |  | December 31, 2024
(in millions) | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships (a) | $ | 182.5 |  |  | $ | (93.0) |  |  | $ | 89.5 |  |  | $ | 165.7 |  |  | $ | (80.7) |  |  | $ | 85.0 |
Other (a) | 10.8 |  |  | (6.0) |  |  | 4.8 |  |  | 7.2 |  |  | (4.9) |  |  | 2.3 |
Total definite-lived intangible assets | 193.3 |  |  | (99.0) |  |  | 94.3 |  |  | 172.9 |  |  | (85.6) |  |  | 87.3 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 119.0 |  |  | — |  |  | 119.0 |  |  | 108.1 |  |  | — |  |  | 108.1 |
Other | 4.3 |  |  | — |  |  | 4.3 |  |  | 4.3 |  |  | — |  |  | 4.3 |
Total indefinite-lived intangible assets | 123.3 |  |  | — |  |  | 123.3 |  |  | 112.4 |  |  | — |  |  | 112.4 |
Total intangible assets | $ | 316.6 |  |  | $ | (99.0) |  |  | $ | 217.6 |  |  | $ | 285.3 |  |  | $ | (85.6) |  |  | $ | 199.7 |
(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 table above includes preliminary estimates of the fair value and useful lives of certain definite and indefinite-lived intangible assets related to the Hog acquisition, which was completed during the first quarter of 2025. As further described in Note 2 – Acquisitions, the preliminary measurements of fair value included in the table above are subject to change during the measurement period as the applicable third-party valuations are finalized. Amortization expense for the three and nine months ended September 30, 2025 was $4.5 million and $13.3 million, respectively. Amortization expense for the three and nine months ended September 30, 2024 was $3.8 million and $11.2 million, respectively. The Company currently estimates that aggregate amortization expense will be approximately $4.5 million for the remainder of 2025, $17.9 million in 2026, $17.0 million in 2027, $16.7 million in 2028, $11.0 million in 2029, and $27.3 million thereafter. Actual amounts of amortization may differ from estimated amounts due to changes in foreign currency rates, measurement period adjustments for the Hog acquisition, impairment of intangible assets, and other events.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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