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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2023
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 six months ended June 30, 2023, by segment:
(in millions) | Environmental Solutions |  | Safety & Security Systems |  | Total
Balance at January 1, 2023 | $ | 343.8 |  |  | $ | 109.6 |  |  | $ | 453.4 |
Acquisitions, including measurement period adjustments | 20.9 |  |  | — |  |  | 20.9 |
Translation adjustments | 0.3 |  |  | 0.8 |  |  | 1.1 |
Balance at June 30, 2023 | $ | 365.0 |  |  | $ | 110.4 |  |  | $ | 475.4 |
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:
| June 30, 2023 |  | December 31, 2022
(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) | $ | 162.6 |  |  | $ | (59.1) |  |  | $ | 103.5 |  |  | $ | 153.7 |  |  | $ | (52.0) |  |  | $ | 101.7 |
Other (a) | 8.3 |  |  | (3.9) |  |  | 4.4 |  |  | 5.7 |  |  | (3.4) |  |  | 2.3 |
Total definite-lived intangible assets | 170.9 |  |  | (63.0) |  |  | 107.9 |  |  | 159.4 |  |  | (55.4) |  |  | 104.0 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 104.5 |  |  | — |  |  | 104.5 |  |  | 99.9 |  |  | — |  |  | 99.9 |
Other | 4.3 |  |  | — |  |  | 4.3 |  |  | 4.3 |  |  | — |  |  | 4.3 |
Total indefinite-lived intangible assets | 108.8 |  |  | — |  |  | 108.8 |  |  | 104.2 |  |  | — |  |  | 104.2 |
Total intangible assets | $ | 279.7 |  |  | $ | (63.0) |  |  | $ | 216.7 |  |  | $ | 263.6 |  |  | $ | (55.4) |  |  | $ | 208.2 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 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:
| June 30, 2023 |  | December 31, 2022
(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) | $ | 162.6 |  |  | $ | (59.1) |  |  | $ | 103.5 |  |  | $ | 153.7 |  |  | $ | (52.0) |  |  | $ | 101.7 |
Other (a) | 8.3 |  |  | (3.9) |  |  | 4.4 |  |  | 5.7 |  |  | (3.4) |  |  | 2.3 |
Total definite-lived intangible assets | 170.9 |  |  | (63.0) |  |  | 107.9 |  |  | 159.4 |  |  | (55.4) |  |  | 104.0 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 104.5 |  |  | — |  |  | 104.5 |  |  | 99.9 |  |  | — |  |  | 99.9 |
Other | 4.3 |  |  | — |  |  | 4.3 |  |  | 4.3 |  |  | — |  |  | 4.3 |
Total indefinite-lived intangible assets | 108.8 |  |  | — |  |  | 108.8 |  |  | 104.2 |  |  | — |  |  | 104.2 |
Total intangible assets | $ | 279.7 |  |  | $ | (63.0) |  |  | $ | 216.7 |  |  | $ | 263.6 |  |  | $ | (55.4) |  |  | $ | 208.2 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 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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