Interest and Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest and Other Income (Expense), Net
Interest income	$ 1.2	$ 0.8	$ 0.3
Interest expense	(12.6)	(15.4)	(13.2)
Exchange gains (losses) on foreign currency transactions	(3.0)	(5.5)	4.1
Pension components	(3.9)	(4.8)	(4.6)
Gain on bargain purchase		0.6	9.2
Other	0.6	2.6
Interest and other income (expense), net	$ (17.7)	$ (21.7)	$ (4.2)