Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Total net revenues	$ 1,170.1	$ 1,059.2
Routing [Member]
Segment Reporting Information [Line Items]
Total net revenues	549.8	513.6
Switching [Member]
Segment Reporting Information [Line Items]
Total net revenues	192.0	131.5
Security [Member]
Segment Reporting Information [Line Items]
Total net revenues	134.2	136.7
Total product [Member]
Segment Reporting Information [Line Items]
Total net revenues	876.0	781.8
Total service [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 294.1	$ 277.4