Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

11. 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.