Basis of Presentation - Prior Year Reclassification (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Research and Development and Engineering Expense [Member]
Change in Accounting Estimate [Line Items]
Prior Period Reclassification Adjustment	$ 1.3
General and Administrative Expense [Member]
Change in Accounting Estimate [Line Items]
Prior Period Reclassification Adjustment	1.1
Selling Expense [Member]
Change in Accounting Estimate [Line Items]
Prior Period Reclassification Adjustment	$ 0.2