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Basis of Presentation - Prior Year Reclassification (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017
Research and Development and Engineering Expense [Member] |  |
Change in Accounting Estimate [Line Items] |  |
Prior Period Reclassification Adjustment | $ 1.3 | $ 2.6
General and Administrative Expense [Member] |  |
Change in Accounting Estimate [Line Items] |  |
Prior Period Reclassification Adjustment | 1.2 | 2.3
Selling Expense [Member] |  |
Change in Accounting Estimate [Line Items] |  |
Prior Period Reclassification Adjustment | $ 0.1 | $ 0.3

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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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