Exit Activities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 1.2
Employee Termination
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	0.8
Other Charges
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 0.4