Interest and Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest and Other Income (Expense), Net
Interest expense, net	$ (3.4)	$ (3.7)
Exchange gains (losses) on foreign currency transactions	0.5	(2.3)
Other	0.6
Interest and other income (expense), net	$ (2.3)	$ (6.0)