Interest and Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest and Other Income (Expense), Net
Interest expense, net	$ (2.3)	$ (3.6)	$ (8.3)	$ (11.1)
Exchange (losses) gains on foreign currency transactions	(0.6)	0.3	(1.6)	(3.9)
Pension components	(0.9)	(1.4)	(2.2)	(3.2)
Other	0.1	0.8	0.6	3.2
Interest and other income (expense), net	$ (3.7)	$ (3.9)	$ (11.5)	$ (15.0)