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Goodwill (Tables)
 12 Months Ended
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.