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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021, by segment:
(in millions) | Environmental Solutions |  | Safety & Security Systems |  | Total
Balance at January 1, 2021 | $ | 279.9 |  |  | $ | 114.3 |  |  | $ | 394.2 |
Acquisitions | 14.0 |  |  | — |  |  | 14.0 |
Translation adjustments | 0.2 |  |  | (0.8) |  |  | (0.6) |
Balance at June 30, 2021 | $ | 294.1 |  |  | $ | 113.5 |  |  | $ | 407.6 |
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, 2021 |  | December 31, 2020
(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) | $ | 125.5 |  |  | $ | (34.6) |  |  | $ | 90.9 |  |  | $ | 108.6 |  |  | $ | (29.6) |  |  | $ | 79.0 |
Other (a) | 4.8 |  |  | (2.6) |  |  | 2.2 |  |  | 4.4 |  |  | (2.3) |  |  | 2.1 |
Total definite-lived intangible assets | 130.3 |  |  | (37.2) |  |  | 93.1 |  |  | 113.0 |  |  | (31.9) |  |  | 81.1 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 83.0 |  |  | — |  |  | 83.0 |  |  | 72.4 |  |  | — |  |  | 72.4 |
Total indefinite-lived intangible assets | 83.0 |  |  | — |  |  | 83.0 |  |  | 72.4 |  |  | — |  |  | 72.4 |
Total intangible assets | $ | 213.3 |  |  | $ | (37.2) |  |  | $ | 176.1 |  |  | $ | 185.4 |  |  | $ | (31.9) |  |  | $ | 153.5 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and seven 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:
| June 30, 2021 |  | December 31, 2020
(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) | $ | 125.5 |  |  | $ | (34.6) |  |  | $ | 90.9 |  |  | $ | 108.6 |  |  | $ | (29.6) |  |  | $ | 79.0 |
Other (a) | 4.8 |  |  | (2.6) |  |  | 2.2 |  |  | 4.4 |  |  | (2.3) |  |  | 2.1 |
Total definite-lived intangible assets | 130.3 |  |  | (37.2) |  |  | 93.1 |  |  | 113.0 |  |  | (31.9) |  |  | 81.1 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 83.0 |  |  | — |  |  | 83.0 |  |  | 72.4 |  |  | — |  |  | 72.4 |
Total indefinite-lived intangible assets | 83.0 |  |  | — |  |  | 83.0 |  |  | 72.4 |  |  | — |  |  | 72.4 |
Total intangible assets | $ | 213.3 |  |  | $ | (37.2) |  |  | $ | 176.1 |  |  | $ | 185.4 |  |  | $ | (31.9) |  |  | $ | 153.5 |
(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and seven years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.

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