Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Restructuring liability [Roll Forward]
Balance, beginning of period	$ 1.4
Additional Provisions (Reversals)	0
Cash expenditures	(0.8)
Balance, end of period	0.6
Contract costs [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period	0.8
Additional Provisions (Reversals)	0
Cash expenditures	(0.3)
Balance, end of period	0.5
Severance and other employee benefits [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period	0.6
Additional Provisions (Reversals)	0
Cash expenditures	(0.5)
Balance, end of period	$ 0.1