Intangible Assets

3 Months Ended

Mar. 31, 2019

Intangible assets consisted of the following:



	As of March 31,			As of December 31,			Weighted- average remaining useful life (In years)
	2019			2018			Weighted- average remaining useful life (In years)
Developed technology	$	25.0		$	47.0		4.9
Customer relationships	20.5			—			4.8
Software	20.0			19.2			2.2
Patents	13.0			13.0			7.9
Assembled workforce in asset acquisitions	12.6			12.6			1.6
Licenses	4.6			4.6			2.2
Trademarks and trade names	5.2			0.7			4.9
Other	3.3			3.3			6.0
Total intangibles	104.2			100.4
Accumulated amortization	(46.8		)	(85.7		)
Intangible assets, net	$	57.4		$	14.7

During the three months ended March 31, 2019 the Company retired $41.7 million in fully amortized developed technology assets.

Amortization expense was $2.8 million and $1.8 million for the three months ended March 31, 2019 and 2018, respectively.

Expected future amortization expense for intangible assets as of March 31, 2019, is as follows:




Remaining nine months of Fiscal 2019	$	10.8
2020	13.6
2021	11.3
2022	8.0
2023	7.7
Thereafter	6.0
Total	$	57.4