Goodwill and Purchased Intangible Assets, Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 115.1
Total purchased intangible assets, gross	673.5	655.7
Total purchased intangible assets, accumulated amortization	(525.7)	(516.1)
Total purchased intangible assets, impairments and other charges	(32.7)	(32.7)
Total purchased intangible assets, net	115.1	106.9
Technologies and patents [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	592.1	581.4
Finite-lived intangible assets, accumulated amortization	(461.9)	(453.4)
Finite-lived intangible assets, impairments and other charges	(30.5)	(30.5)
Finite-lived intangible assets, net	99.7	97.5
Customer contracts, support agreements, and related relationships [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	80.3	74.3
Finite-lived intangible assets, accumulated amortization	(63.7)	(62.7)
Finite-lived intangible assets, impairments and other charges	(2.2)	(2.2)
Finite-lived intangible assets, net	14.4	9.4
Other intangible assets [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	1.1
Finite-lived intangible assets, accumulated amortization	(0.1)
Finite-lived intangible assets, impairments and other charges	0
Finite-lived intangible assets, net	$ 1.0