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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
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) | Environmental Solutions |  | Safety & Security Systems |  | Total
Balance at December 31, 2020 | $ | 279.9 |  |  | $ | 114.3 |  |  | $ | 394.2 |
Acquisitions | 40.3 |  |  | — |  |  | 40.3 |
Translation adjustments | — |  |  | (2.3) |  |  | (2.3) |
Balance at December 31, 2021 | 320.2 |  |  | 112.0 |  |  | 432.2 |
Acquisitions, including measurement period adjustments | 24.0 |  |  | — |  |  | 24.0 |
Translation adjustments | (0.4) |  |  | (2.4) |  |  | (2.8) |
Balance at December 31, 2022 | $ | 343.8 |  |  | $ | 109.6 |  |  | $ | 453.4 |
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:
| 2022 |  | 2021
(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) | $ | 153.7 |  |  | $ | (52.0) |  |  | $ | 101.7 |  |  | $ | 146.2 |  |  | $ | (39.8) |  |  | $ | 106.4 |
Other (a) | 5.7 |  |  | (3.4) |  |  | 2.3 |  |  | 5.3 |  |  | (2.9) |  |  | 2.4 |
Total definite-lived intangible assets | 159.4 |  |  | (55.4) |  |  | 104.0 |  |  | 151.5 |  |  | (42.7) |  |  | 108.8 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 99.9 |  |  | — |  |  | 99.9 |  |  | 96.9 |  |  | — |  |  | 96.9 |
Other | 4.3 |  |  | — |  |  | 4.3 |  |  | — |  |  | — |  |  | — |
Total indefinite-lived intangible assets | 104.2 |  |  | — |  |  | 104.2 |  |  | 96.9 |  |  | — |  |  | 96.9 |
Total intangible assets | $ | 263.6 |  |  | $ | (55.4) |  |  | $ | 208.2 |  |  | $ | 248.4 |  |  | $ | (42.7) |  |  | $ | 205.7 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and 7 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 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:
| 2022 |  | 2021
(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) | $ | 153.7 |  |  | $ | (52.0) |  |  | $ | 101.7 |  |  | $ | 146.2 |  |  | $ | (39.8) |  |  | $ | 106.4 |
Other (a) | 5.7 |  |  | (3.4) |  |  | 2.3 |  |  | 5.3 |  |  | (2.9) |  |  | 2.4 |
Total definite-lived intangible assets | 159.4 |  |  | (55.4) |  |  | 104.0 |  |  | 151.5 |  |  | (42.7) |  |  | 108.8 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 99.9 |  |  | — |  |  | 99.9 |  |  | 96.9 |  |  | — |  |  | 96.9 |
Other | 4.3 |  |  | — |  |  | 4.3 |  |  | — |  |  | — |  |  | — |
Total indefinite-lived intangible assets | 104.2 |  |  | — |  |  | 104.2 |  |  | 96.9 |  |  | — |  |  | 96.9 |
Total intangible assets | $ | 263.6 |  |  | $ | (55.4) |  |  | $ | 208.2 |  |  | $ | 248.4 |  |  | $ | (42.7) |  |  | $ | 205.7 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and 7 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.

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