Interest and Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest and Other Income (Expense), Net
Interest expense, net	$ (3.6)	$ (3.4)	$ (11.1)	$ (9.4)
Exchange gains (losses) on foreign currency transactions	0.3		(3.9)	(1.6)
Other	0.8	0.5	3.2	(0.1)
Interest and other income (expense), net	$ (2.5)	$ (2.9)	$ (11.8)	$ (11.1)