Restructuring (2011 Restructuring) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 11.6	$ 1.2	$ 28.7
2011 Restructuring Plan [Member]
Severance Costs		1.2
Employees affected		50
Facility Charge [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	0.5	4.9	1.2
Restructuring liability payment	(0.4)	(4.4)	(5.6)
Restructuring liability, ending balance	$ 0.3	$ 0.5	$ 4.9