Restructuring (2012 Restructuring) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Restructuring Charges	$ 7.6	$ 0	$ 7.6	$ 0
Restructuring liability, ending balance					0.2
2012 Restructuring Plan [Member]
Restructuring Charges			7.6
Restructuring liability, ending balance	7.6		7.6
Corporate [Member] | 2012 Restructuring Plan [Member]
Restructuring Charges			6.4
Customer Management [Member]
Restructuring Charges	1.2	0	1.2	0
Customer Management [Member] | 2012 Restructuring Plan [Member]
Restructuring Charges			$ 1.2
Professional Employees [Member] | 2012 Restructuring Plan [Member]
Employees affected			100