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Other Financial Information, Deferred Revenue (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Deferred Revenue [Abstract]    
Deferred revenue, net $ 1,481.1 $ 1,168.1
Deferred Revenue Reported as [Abstract]    
Deferred revenue, current 1,032.0 822.9
Deferred revenue, long-term 449.1 345.2
Deferred product revenue [Member]    
Deferred Revenue [Abstract]    
Undelivered product commitments and other product deferrals 302.4 210.1
Distributor inventory and other sell-through items 74.2 81.8
Deferred gross product revenue 376.6 291.9
Deferred cost of product revenue (53.7) (51.6)
Deferred revenue, net 322.9 240.3
Deferred service revenue [Member]    
Deferred Revenue [Abstract]    
Deferred revenue, net $ 1,158.2 $ 927.8