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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | 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 |
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:
| 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.
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:
| 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.

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