Interest and Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest and Other Income (Expense), Net
Interest income	$ 0.9	$ 1.0	$ 0.9
Interest expense	(14.3)	(7.3)	(5.6)
Exchange losses on foreign currency transactions	(6.8)	(4.4)	(1.5)
Gain on disposal of product line	2.2
Other	0.3	0.6	0.6
Interest and other income (expense), net	$ (17.7)	$ (10.1)	$ (5.6)