Other Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Severance and post-employment benefits	$ 2.0	$ 0.0
Asset-related charges	0.1	0.0
Other charges	1.2	0.0
Total restructuring and related charges	3.3	0.0
Development and licensing income	(0.2)	(0.4)
Contingent consideration	0.3	0.3
Other items	(0.3)	1.0
Total other expense	$ 3.1	$ 0.9