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Other Financial Information - Other Long Term Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 01, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2014
Other Financial Information [Line Items]                
Proceeds from Pulse note receivable       $ 75.0 $ 0.0      
Junos Pulse                
Other Financial Information [Line Items]                
Consideration               $ 230.7
Cash Consideration               105.7
Working capital adjustment               19.3
Note receivable carrying value               $ 125.0
Note receivable $ 58.0 $ 58.5   58.5     $ 132.9  
Proceeds from Pulse note receivable $ 75.0              
Interest income   $ 2.2 $ 2.7 $ 4.9 $ 5.3      
Prepaid expenses and other current assets [Member] | Junos Pulse                
Other Financial Information [Line Items]                
Note receivable carrying value           $ 75.0