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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The following table summarizes the carrying amount of goodwill by segment:
(in millions) | Environmental Solutions |  | Safety & Security Systems |  | Total
Balance at December 31, 2014 | $ | 120.4 |  |  | $ | 114.8 |  |  | $ | 235.2 |
Translation adjustments | — |  |  | (3.6 | ) |  | (3.6 | )
Balance at December 31, 2015 | 120.4 |  |  | 111.2 |  |  | 231.6 |
Acquisitions | 7.1 |  |  | — |  |  | 7.1 |
Translation adjustments | (0.3 | ) |  | (1.9 | ) |  | (2.2 | )
Balance at December 31, 2016 | $ | 127.2 |  |  | $ | 109.3 |  |  | $ | 236.5 |
The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:
| December 31, 2016 |  | December 31, 2015
(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) | $ | 0.8 |  |  | $ | (0.1 | ) |  | $ | 0.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Other (a) | 1.1 |  |  | (0.4 | ) |  | 0.7 |  |  | 0.6 |  |  | (0.4 | ) |  | 0.2 |
Total definite-lived intangible assets | 1.9 |  |  | (0.5 | ) |  | 1.4 |  |  | 0.6 |  |  | (0.4 | ) |  | 0.2 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | 8.8 |  |  | — |  |  | 8.8 |  |  |  |  |  | — |  |  | — |
Total indefinite-lived intangible assets | 8.8 |  |  | — |  |  | 8.8 |  |  | — |  |  | — |  |  | — |
Total intangible assets | $ | 10.7 |  |  | $ | (0.5 | ) |  | $ | 10.2 |  |  | $ | 0.6 |  |  | $ | (0.4 | ) |  | $ | 0.2 |
(a) | Average useful life of customer relationships and other definite-lived intangible assets is estimated at 10 years.
Amortization expense for the years ended December 31, 2016, 2015 and 2014 was immaterial. The Company currently estimates that aggregate amortization expense will not exceed $0.2 million in any future year.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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