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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2018 | $ | 263.2 |  |  | $ | 111.9 |  |  | $ | 375.1 |
Acquisitions | 13.9 |  |  | — |  |  | 13.9 |
Translation adjustments | 0.2 |  |  | (0.4) |  |  | (0.2) |
Balance at December 31, 2019 | 277.3 |  |  | 111.5 |  |  | 388.8 |
Acquisitions | 2.5 |  |  | — |  |  | 2.5 |
Translation adjustments | 0.1 |  |  | 2.8 |  |  | 2.9 |
Balance at December 31, 2020 | $ | 279.9 |  |  | $ | 114.3 |  |  | $ | 394.2 |
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:
| 2020 |  | 2019
(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) | $ | 108.6 |  |  | $ | (29.6) |  |  | $ | 79.0 |  |  | $ | 108.6 |  |  | $ | (20.5) |  |  | $ | 88.1 |
Other (a) | 4.4 |  |  | (2.3) |  |  | 2.1 |  |  | 4.2 |  |  | (1.6) |  |  | 2.6 |
Total definite-lived intangible assets | 113.0 |  |  | (31.9) |  |  | 81.1 |  |  | 112.8 |  |  | (22.1) |  |  | 90.7 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 72.4 |  |  | — |  |  | 72.4 |  |  | 72.2 |  |  | — |  |  | 72.2 |
Total indefinite-lived intangible assets | 72.4 |  |  | — |  |  | 72.4 |  |  | 72.2 |  |  | — |  |  | 72.2 |
Total intangible assets | $ | 185.4 |  |  | $ | (31.9) |  |  | $ | 153.5 |  |  | $ | 185.0 |  |  | $ | (22.1) |  |  | $ | 162.9 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and eight 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:
| 2020 |  | 2019
(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) | $ | 108.6 |  |  | $ | (29.6) |  |  | $ | 79.0 |  |  | $ | 108.6 |  |  | $ | (20.5) |  |  | $ | 88.1 |
Other (a) | 4.4 |  |  | (2.3) |  |  | 2.1 |  |  | 4.2 |  |  | (1.6) |  |  | 2.6 |
Total definite-lived intangible assets | 113.0 |  |  | (31.9) |  |  | 81.1 |  |  | 112.8 |  |  | (22.1) |  |  | 90.7 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 72.4 |  |  | — |  |  | 72.4 |  |  | 72.2 |  |  | — |  |  | 72.2 |
Total indefinite-lived intangible assets | 72.4 |  |  | — |  |  | 72.4 |  |  | 72.2 |  |  | — |  |  | 72.2 |
Total intangible assets | $ | 185.4 |  |  | $ | (31.9) |  |  | $ | 153.5 |  |  | $ | 185.0 |  |  | $ | (22.1) |  |  | $ | 162.9 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and eight years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.

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