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Goodwill and Other Intangibles Assets
 9 Months Ended
Sep. 30, 2019
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, 2019, by segment:
(in millions)
Environmental
Solutions
 
Safety & Security
Systems
 
Total
Balance at January 1, 2019
$
263.2

 
$
111.9

 
$
375.1

Translation adjustments
0.1

 
(1.6
)
 
(1.5
)
Acquisitions
18.5

 
—

 
18.5

Balance at September 30, 2019
$
281.8

 
$
110.3

 
$
392.1


The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:
 
September 30, 2019
 
December 31, 2018
(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)
$
108.6

 
$
(18.2
)
 
$
90.4

 
$
90.9

 
$
(12.1
)
 
$
78.8

Other (a)
4.2

 
(1.5
)
 
2.7

 
2.9

 
(1.3
)
 
1.6

Total definite-lived intangible assets
112.8

 
(19.7
)
 
93.1

 
93.8

 
(13.4
)
 
80.4

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Trade names
72.0

 
—

 
72.0

 
62.7

 
—

 
62.7

Total indefinite-lived intangible assets
72.0

 
—

 
72.0

 
62.7

 
—

 
62.7

Total intangible assets
$
184.8

 
$
(19.7
)
 
$
165.1

 
$
156.5

 
$
(13.4
)
 
$
143.1


(a)
Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and eight 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 MRL acquisition completed during 2019. 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 September 30, 2019 and 2018 was $2.4 million and $2.0 million, respectively. Amortization expense for the nine months ended September 30, 2019 and 2018 was $6.4 million and $6.1 million, respectively.
The Company currently estimates that aggregate amortization expense will be approximately $2.4 million for the remainder of 2019, $9.6 million in 2020, $9.6 million in 2021, $9.5 million in 2022, $9.3 million in 2023, and $52.7 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 MRL acquisition, impairment of intangible assets and other events.