Other Financial Information, Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred product revenue [Abstract]
Deferred revenue	$ 1,021.2	$ 923.4
Deferred Revenue Reported as [Abstract]
Deferred revenue, current	731.9	693.5
Deferred revenue, long-term	289.3	229.9
Sales Revenue, Product, Net [Member]
Deferred product revenue [Abstract]
Undelivered product commitments and other product deferrals	212.2	256.9
Distributor inventory and other sell-through items	133.9	138.4
Deferred gross product revenue	346.1	395.3
Deferred cost of product revenue	(66.3)	(99.4)
Deferred revenue	279.8	295.9
Sales Revenue, Service, Net [Member]
Deferred product revenue [Abstract]
Deferred revenue	$ 741.4	$ 627.5