Interest and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Nonoperating Income (Expense) [Abstract]
Interest expense	$ 9.7	$ 9.2	$ 28.1	$ 27.9
Interest income	(1.2)	(1.0)	(3.4)	(2.5)
Foreign exchange losses	0.1	0.0	0.4	1.6
Miscellaneous expenses, net	2.3	3.2	11.1	7.4
Interest and other expenses	$ 10.9	$ 11.4	$ 36.2	$ 34.4