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Goodwill | 12 Months Ended
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Dec. 31, 2018
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 by segment:
(in millions) | Environmental Solutions |  | Safety & Security Systems |  | Total
Balance at December 31, 2016 | $ | 127.2 |  |  | $ | 109.3 |  |  | $ | 236.5 |
Acquisitions | 136.0 |  |  | — |  |  | 136.0 |
Translation adjustments | 0.4 |  |  | 4.4 |  |  | 4.8 |
Balance at December 31, 2017 | 263.6 |  |  | 113.7 |  |  | 377.3 |
Translation adjustments | (0.4 | ) |  | (1.8 | ) |  | (2.2 | )
Balance at December 31, 2018 | $ | 263.2 |  |  | $ | 111.9 |  |  | $ | 375.1 |
The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:
| December 31, 2018 |  | December 31, 2017
(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) | $ | 90.9 |  |  | $ | (12.1 | ) |  | $ | 78.8 |  |  | $ | 90.9 |  |  | $ | (4.6 | ) |  | $ | 86.3 |
Other (a) | 2.9 |  |  | (1.3 | ) |  | 1.6 |  |  | 2.9 |  |  | (0.9 | ) |  | 2.0 |
Total definite-lived intangible assets | 93.8 |  |  | (13.4 | ) |  | 80.4 |  |  | 93.8 |  |  | (5.5 | ) |  | 88.3 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 62.7 |  |  | — |  |  | 62.7 |  |  | 63.5 |  |  | — |  |  | 63.5 |
Total indefinite-lived intangible assets | 62.7 |  |  | — |  |  | 62.7 |  |  | 63.5 |  |  | — |  |  | 63.5 |
Total intangible assets | $ | 156.5 |  |  | $ | (13.4 | ) |  | $ | 143.1 |  |  | $ | 157.3 |  |  | $ | (5.5 | ) |  | $ | 151.8 |
(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.
Amortization expense for the years ended December 31, 2018 and 2017 was $8.0 million and $4.8 million, respectively. Amortization expense for the year ended December 31, 2016 was immaterial. The Company currently estimates that aggregate amortization expense will be approximately $8.0 million in 2019, $8.0 million in 2020, $7.9 million in 2021, $7.8 million in 2022, $7.6 million in 2023 and $41.0 million thereafter. Actual amounts of amortization may differ from estimated amounts due to additional intangible asset acquisitions, changes in foreign currency rates, impairment of intangible assets and other events.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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