Interest and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Nonoperating Income (Expense) [Abstract]
Interest expense	$ 9.1	$ 9.2	$ 18.4	$ 18.7
Interest income	(1.2)	(0.8)	(2.2)	(1.5)
Foreign exchange losses	0.2	0.7	0.3	1.6
Miscellaneous expenses, net	2.3	1.2	8.8	4.2
Interest and other expenses	$ 10.4	$ 10.3	$ 25.3	$ 23.0