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Goodwill and Other Intangibles Assets
9 Months Ended
Sep. 30, 2017
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 nine months ended September 30, 2017, by segment:
(in millions)
Environmental
Solutions
 
Safety & Security
Systems
 
Total
Balance at January 1, 2017
$
127.2

 
$
109.3

 
$
236.5

Translation adjustments
0.4

 
3.8

 
4.2

Acquisitions
130.7

 

 
130.7

Balance at September 30, 2017
$
258.3

 
$
113.1

 
$
371.4


The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:
 
September 30, 2017
 
December 31, 2016
(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

 
$
(2.7
)
 
$
88.2

 
$
0.8

 
$
(0.1
)
 
$
0.7

Other (a)
4.3

 
(0.9
)
 
3.4

 
1.1

 
(0.4
)
 
0.7

Total definite-lived intangible assets
95.2

 
(3.6
)
 
91.6

 
1.9

 
(0.5
)
 
1.4

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Trade names
69.5

 

 
69.5

 
8.8

 

 
8.8

Total indefinite-lived intangible assets
69.5

 

 
69.5

 
8.8

 

 
8.8

Total intangible assets
$
164.7

 
$
(3.6
)
 
$
161.1

 
$
10.7

 
$
(0.5
)
 
$
10.2

(a)
Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and 5 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 TBEI acquisition completed during 2017. 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 and nine months ended September 30, 2017 was $2.2 million and $3.0 million, respectively. Amortization expense for the three and nine months ended September 30, 2016 was immaterial.
The Company currently estimates that aggregate amortization expense will be approximately $2.2 million for the remainder of 2017, $8.7 million in 2018, $8.7 million in 2019, $8.1 million in 2020, $7.7 million in 2021, and $56.2 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 TBEI acquisition, impairment of intangible assets and other events.