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Summary of Significant Accounting Policies - Research and Engineering (Details) - In Process Research and Development - Two T D Drilling - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible Assets |  |  |
Intangible Assets | $ 47.7 |  |
Transfer of research and development expenses to completed technology | $ 0.0 | $ 0.0 | $ 0.0

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