Other Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Abstract]
Development and licensing income	$ (0.2)	$ (0.2)
Contingent consideration	0.0	0.2
Foreign exchange transaction gains	(3.5)	(3.8)
Other items	0.2	0.9
Total other income	$ (3.5)	$ (2.3)