Basis of Presentation - Prior Year Reclassification (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Research and Development and Engineering Expense [Member]
Change in Accounting Estimate [Line Items]
Prior Period Reclassification Adjustment	$ 2.6
General and Administrative Expense [Member]
Change in Accounting Estimate [Line Items]
Prior Period Reclassification Adjustment	0.7	$ 2.3
Selling Expense [Member]
Change in Accounting Estimate [Line Items]
Prior Period Reclassification Adjustment	0.3
Cost of Sales [Member]
Change in Accounting Estimate [Line Items]
Prior Period Reclassification Adjustment	$ 0.7	$ 1.8	$ 2.1