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Goodwill and Purchased Intangible Assets
3 Months Ended
Mar. 31, 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 March 31, 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 March 31, 2017 and December 31, 2016, were $125.9 million and $130.2 million, respectively. Amortization expense during the three months ended March 31, 2017 and March 31, 2016 was $4.3 million and $3.3 million, respectively.