Other Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Severance and post-employment benefits	$ 0.0	$ 8.9	$ 0.0
Asset-related charges	0.0	17.3	0.0
Other charges	0.0	0.2	0.0
Total restructuring and related charges	0.0	26.4	0.0
Pension settlement charge	0.0	0.0	50.4
Pension curtailment gain	0.0	(2.1)	0.0
Executive retirement and related costs	0.0	0.0	10.9
Venezuela currency devaluation	0.0	2.7	0.0
Venezuela deconsolidation	11.1	0.0	0.0
Development and licensing income	(10.6)	(1.5)	(1.5)
Contingent consideration	(2.4)	2.3	1.1
Other items	3.9	(0.1)	(0.8)
Total other expense	$ 2.0	$ 27.7	$ 60.1