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Segments (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Segment Reporting Information [Line Items]    
Number of reportable segments | segment 1  
Product $ 828.9 $ 753.0
Service 392.1 344.9
Total net revenues 1,221.0 1,097.9
Routing [Member]    
Segment Reporting Information [Line Items]    
Product 521.6 504.1
Switching [Member]    
Segment Reporting Information [Line Items]    
Product 241.6 175.5
Security [Member]    
Segment Reporting Information [Line Items]    
Product $ 65.7 $ 73.4