Restructuring (2012 Restructuring) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended				12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012 2012 Restructuring Plan [Member]	Dec. 31, 2012 Employee Severance [Member] 2012 Restructuring Plan [Member]	Sep. 30, 2013 Facility Closing [Member]	Dec. 31, 2012 Facility Closing [Member]	Dec. 31, 2012 Facility Closing [Member] 2012 Restructuring Plan [Member]	Dec. 31, 2012 Professional Employees [Member] 2012 Restructuring Plan [Member]
Restructuring Charges	$ 4.3	$ 1.4	$ 5.4	$ 9.0	$ 11.6	$ 11.4			$ 0.2
Restructuring liability, ending balance					$ 5.2		$ 0.1	$ 0.3
Employees affected										100