Interest and Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest and Other Income (Expense), Net
Interest expense, net	$ (3.8)	$ (2.9)	$ (7.5)	$ (6.0)
Exchange gains (losses) on foreign currency transactions	(1.9)	0.7	(4.2)	(1.6)
Other	2.4	(0.4)	2.4	(0.6)
Interest and other income (expense), net	$ (3.3)	$ (2.6)	$ (9.3)	$ (8.2)