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 September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Routing	$	496.4	$	585.8	$	1,395.1	$	1,679.9
Switching	221.1		212.6		705.9		730.2
Security	77.2		71.3		229.4		205.7
Total product	794.7		869.7		2,330.4		2,615.8

Total service	385.1		388.1		1,136.1		1,171.9
Total	$	1,179.8	$	1,257.8	$	3,466.5	$	3,787.7

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



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cloud	$	250.0	$	344.9	$	798.1	$	1,056.1
Service Provider	543.6		576.9		1,546.8		1,707.8
Enterprise	386.2		336.0		1,121.6		1,023.8
Total	$	1,179.8	$	1,257.8	$	3,466.5	$	3,787.7

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 September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Americas:
United States	$	597.1	$	668.8	$	1,754.2	$	2,076.0
Other	46.0		60.4		152.2		165.6
Total Americas	643.1		729.2		1,906.4		2,241.6
Europe, Middle East, and Africa	329.9		298.6		946.8		871.3
Asia Pacific	206.8		230.0		613.3		674.8
Total	$	1,179.8	$	1,257.8	$	3,466.5	$	3,787.7