Interest and Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest and Other Income (Expense), Net
Interest income	$ 1.0	$ 0.9	$ 1.0
Interest expense	(7.3)	(5.6)	(7.5)
Exchange losses on foreign currency transactions	(4.4)	(1.5)	(1.9)
Other	0.6	0.6	0.8
Interest and other income (expense), net	$ (10.1)	$ (5.6)	$ (7.6)