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Goodwill and Other Intangibles Assets | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | GOODWILL AND OTHER INTANGIBLE ASSETS 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 |
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. The table above includes preliminary estimates of the fair value and useful lives of certain definite and indefinite-lived intangible assets related to the OSW acquisition completed during 2021. As further described in Note 2 – Acquisitions, the preliminary measurements of fair value included in the table above are subject to change during the measurement period as valuations are finalized. Amortization expense for the three months ended June 30, 2021 and 2020 was $2.8 million and $2.4 million, respectively. Amortization expense for the six months ended June 30, 2021 and 2020 was $5.4 million and $4.8 million, respectively. The Company currently estimates that aggregate amortization expense will be approximately $5.6 million for the remainder of 2021, $11.0 million in 2022, $10.9 million in 2023, $10.8 million in 2024, $10.7 million in 2025, and $44.1 million thereafter. Actual amounts of amortization may differ from estimated amounts due to additional intangible asset acquisitions, changes in foreign currency rates, measurement period adjustments for the OSW acquisition, impairment of intangible assets and other events.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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