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Basis of Presentation - Prior Year Reclassification (Details) $ in Millions | 3 Months Ended
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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

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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