Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Restructuring Reserve [Line Items]
Restructuring and related cost, expected cost	$ 14.0
Restructuring Reserve [Roll Forward]
Beginning Balance	18.2
Charges	7.7	[1]	2.0	[1]
Cash payments	(12.1)
Non-cash settlements and other	0.2
Ending Balance	14.0
Restructuring Plan 2012 [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, cost incurred to date	101.1
Restructuring Reserve [Roll Forward]
Charges	7.8
Restructuring Plan 2012 [Member] | Cost of revenues [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, cost incurred to date	53.6
Restructuring Plan 2012 [Member] | Operating expense [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, cost incurred to date	47.5
Severance [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, expected cost	1.0
Restructuring Reserve [Roll Forward]
Beginning Balance	10.6
Charges	4.4		3.0
Cash payments	(8.2)
Non-cash settlements and other	(0.1)
Ending Balance	6.7
Severance [Member] | Restructuring Plan 2011 [Member]
Restructuring Reserve [Roll Forward]
Charges	0.1
Facilities [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, expected cost	13.0
Restructuring Reserve [Roll Forward]
Beginning Balance	5.2
Charges	2.6		(0.2)
Cash payments	(1.8)
Non-cash settlements and other	(0.2)
Ending Balance	5.8
Contract terminations and other [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	2.4
Charges	0.7		(0.8)
Cash payments	(2.1)
Non-cash settlements and other	0.5
Ending Balance	$ 1.5

[1] Amount includes restructuring charges reported in operating expenses and in cost of revenues.