Interest and Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Nonoperating Income (Expense) [Abstract]
Interest expense	$ 47.0	$ 49.4	$ 49.5
Interest income	(6.0)	(4.8)	(3.6)
Foreign exchange loss	1.4	0.8	2.8
Miscellaneous (income) expense, net	(0.4)	6.5	(4.5)
Interest and other expenses	$ 42.0	$ 51.9	$ 44.2