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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets |
1 1. | 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 March 31, 2019 and December 31, 2018, we had $862.1 million of goodwill recorded in our Packaging segment and $55.2 million of goodwill recorded in our Paper segment. 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):
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | 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 |  |  | 10.6 |  |  | $ | 504.6 |  |  | $ | 153.4 |  |  |  | 10.9 |  |  | $ | 504.6 |  |  | $ | 144.5 |
Trademarks and trade names |  | 9.8 |  |  |  | 34.8 |  |  |  | 18.7 |  |  |  | 10.1 |  |  |  | 34.8 |  |  |  | 18.3 |
Other |  |  | 2.7 |  |  |  | 4.3 |  |  |  | 2.9 |  |  |  | 3.0 |  |  |  | 4.3 |  |  |  | 2.7 |
Total intangible assets (excluding goodwill) |  |  | 10.6 |  |  | $ | 543.7 |  |  | $ | 175.0 |  |  |  | 10.8 |  |  | $ | 543.7 |  |  | $ | 165.5 |
During the three months ended March 31, 2019 and 2018, amortization expense was $9.5 million and $10.4 million, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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