Restructuring (2010 Restructuring) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2010 Restructuring Plan for 2010 [Member] Severance Charge [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member] Severance Charge [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member] Severance Charge [Member] Information Management [Member]	Sep. 30, 2010 Restructuring Plan for 2010 [Member] Severance Charge [Member] Customer Management [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member] Severance Charge [Member] Customer Management [Member]	Sep. 30, 2010 Restructuring Plan for 2010 [Member] Severance Charge [Member] Corporate [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member] Severance Charge [Member] Corporate [Member]	Sep. 30, 2010 Restructuring Plan for 2010 [Member] Facility Charge [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member] Facility Charge [Member]	Sep. 30, 2011 Facility Charge [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member] Professional Employees [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member] Non-Salaried Employees [Member]	Sep. 30, 2011 Customer Management [Member]	Sep. 30, 2010 Customer Management [Member]	Sep. 30, 2011 Customer Management [Member]	Sep. 30, 2010 Customer Management [Member]	Sep. 30, 2011 Information Management [Member]	Sep. 30, 2010 Information Management [Member]	Sep. 30, 2011 Information Management [Member]	Sep. 30, 2010 Information Management [Member]	Sep. 30, 2011 Restructuring Plan for 2010 [Member]	Sep. 30, 2010 Restructuring Plan for 2010 [Member]	Dec. 31, 2010 Restructuring Plan for 2010 [Member]
Restructuring liability, beginning balance														$ 20.7											$ 12.4
Restructuring charges	0	0	0	17.6	10.8	22.4	3.0	8.5	13.3	2.3	6.1	6.8	14.3				1.0	0	1.0	15.3	(1.2)	0	(1.2)	0		17.6	36.7
Employees affected															1,000	1,400
Restructuring liability payment														(6.9)											(10.9)
Restructuring reserve accrual adjustment														(2.8)
Restructuring liability, ending balance														$ 11.0											$ 1.5		$ 12.4