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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

Goodwill

Goodwill represents the excess of the cost of an acquired business over the fair value of the identifiable tangible and intangible assets acquired and liabilities assumed in a business combination. At both June 30, 2016 and December 31, 2015 we had $488.8 million of goodwill recorded in our Packaging segment and $55.2 million of goodwill recorded in our Paper segment on our Consolidated Balance Sheets.

Intangible Assets

Intangible assets are primarily comprised of customer relationships and trademarks and trade names.

The weighted average remaining useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):
 
June 30, 2016
 
December 31, 2015
 
Weighted Average Remaining Useful Life (in Years)
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Weighted Average Remaining Useful Life (in Years)
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
Customer relationships
12.9
 
$
311.5

 
$
67.5

 
13.3
 
$
311.5

 
$
57.3

Trademarks and trade names
13.5
 
21.8

 
6.3

 
13.6
 
21.8

 
5.2

Other
0.7
 
0.2

 
0.2

 
1.2
 
0.2

 
0.2

Total intangible assets (excluding goodwill)
12.9
 
$
333.5

 
$
74.0

 
13.6
 
$
333.5

 
$
62.7



During the six months ended June 30, 2016 and 2015, amortization expense was $11.2 million and $11.4 million, respectively.