Interest and Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest and Other Income (Expense), Net
Interest income	$ 0.1	$ 0.2	$ 0.3	$ 0.4
Interest expense	(3.6)	(1.6)	(7.1)	(3.1)
Exchange gains (losses) on foreign currency transactions	0.7	(3.8)	(2.3)	(6.7)
Other		(0.5)	(1.2)	(1.3)
Interest and other income (expense), net	$ (2.8)	$ (5.7)	$ (10.3)	$ (10.7)