Segments

The Company operates in one reportable segment. The Company's chief executive officer, who is the chief operating decision maker, reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance, accompanied by disaggregated information about net revenues by product and service, customer vertical, and geographic region as presented below.

The following table presents net revenues by product and service (in millions):



	Three Months Ended March 31,
	2019		2018
Routing	$	374.7	$	408.1
Switching	176.4		230.0
Security	67.6		72.7
Total product	618.7		710.8

Total service	383.0		371.8
Total	$	1,001.7	$	1,082.6

The following table presents net revenues by customer vertical^(*) (in millions):



	Three Months Ended March 31,
	2019		2018
Cloud	$	223.1	$	270.9
Service Provider	435.6		480.1
Enterprise	343.0		331.6
Total	$	1,001.7	$	1,082.6

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^(*)	Certain insignificant prior-period amounts have been reclassified to conform to the current-period presentation.

The Company attributes revenues to geographic region based on the customer’s shipping address. The following table presents net revenues by geographic region (in millions):



	Three Months Ended March 31,
	2019		2018
Americas:
United States	$	476.6	$	532.3
Other	67.0		55.3
Total Americas	543.6		587.6
Europe, Middle East, and Africa	286.2		308.0
Asia Pacific	171.9		187.0
Total	$	1,001.7	$	1,082.6