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Goodwill and Purchased Intangible Assets
6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Purchased Intangible Assets
Goodwill and Purchased Intangible Assets

Goodwill
The following table presents goodwill activity (in millions):
Balance as of December 31, 2016
$
3,081.7

 Other(*)
(2.3
)
Balance as of June 30, 2017
$
3,079.4


 ________________________________
(*) Other primarily consists of certain purchase accounting adjustments related to previously completed business combinations.
Purchased Intangible Assets

The Company’s purchased intangible assets as of June 30, 2017 and December 31, 2016, were $121.7 million and $130.2 million, respectively. Amortization expense was $4.2 million and $8.5 million during the three and six months ended June 30, 2017, respectively, and $4.8 million and $8.1 million during the three and six months ended June 30, 2016, respectively.