Goodwill and Purchased Intangible Assets, Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Goodwill [Roll Forward]
Balance as of December 31, 2012	$ 4,057.8
Goodwill, reclassifications	0
Balance as of March 31, 2013	4,057.8
Goodwill, impairment loss	0	0
PSD Segment [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2012	1,866.3
Goodwill, reclassifications	(179.0)
Balance as of March 31, 2013	1,687.3
SSD Segment [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2012	2,191.5
Goodwill, reclassifications	179.0
Balance as of March 31, 2013	$ 2,370.5