Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Restructuring Reserve [Roll Forward]
December 31, 2012					$ 18.2
Charges	8.8	[1]	3.2	[1]	16.5	[1]	5.2	[1]
Cash Payments					(18.3)
Non-cash Settlements and Other					(4.4)
June 30, 2013	12.0				12.0
Restructuring and related cost, expected cost					1.5
Restructuring Plan 2012 [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, cost incurred to date					109.9
Restructuring Reserve [Roll Forward]
Charges	8.8				16.6
Restructuring Plan 2012 [Member] | Cost of revenues [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, cost incurred to date					54.4
Restructuring Plan 2012 [Member] | Operating expense [Member]
Restructuring Reserve [Line Items]
Restructuring and related cost, cost incurred to date					55.5
Severance [Member]
Restructuring Reserve [Roll Forward]
December 31, 2012					10.6
Charges	0.8		1.3		5.2		4.3
Cash Payments					(12.0)
Non-cash Settlements and Other					(0.1)
June 30, 2013	3.7				3.7
Restructuring and related cost, expected cost					1.0
Severance [Member] | Restructuring Plan 2011 [Member]
Restructuring Reserve [Roll Forward]
Charges					(0.1)
Facilities [Member]
Restructuring Reserve [Roll Forward]
December 31, 2012					5.2
Charges	7.7		1.9		10.3		1.7
Cash Payments					(2.8)
Non-cash Settlements and Other					(4.8)
June 30, 2013	7.9				7.9
Restructuring and related cost, expected cost					0.5
Contract terminations and other [Member]
Restructuring Reserve [Roll Forward]
December 31, 2012					2.4
Charges	0.3		0		1.0		(0.8)
Cash Payments					(3.5)
Non-cash Settlements and Other					0.5
June 30, 2013	$ 0.4				$ 0.4

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