Other Financial Information, Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Deferred product revenue:
Total deferred revenue	$ 1,154.2	$ 1,069.3
Reported as:
Current	772.5	705.8
Long-term	381.7	363.5
Total deferred revenue	1,154.2	1,069.3
Sales Revenue, Product, Net [Member]
Deferred product revenue:
Undelivered product commitments and other product deferrals	186.3	184.9
Distributor inventory and other sell-through items	93.8	118.7
Deferred gross product revenue	280.1	303.6
Deferred cost of product revenue	(48.9)	(58.6)
Total deferred revenue	231.2	245.0
Reported as:
Total deferred revenue	231.2	245.0
Sales Revenue, Service, Net [Member]
Deferred product revenue:
Total deferred revenue	923.0	824.3
Reported as:
Total deferred revenue	$ 923.0	$ 824.3