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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

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