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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions | Jul. 19, 2017 | Dec. 31, 2017 | Apr. 02, 2015
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Robtec [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired ownership percentage |  | 70.00% |
Easyway [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired ownership percentage | 5.00% | 70.00% | 65.00%
Value of voting rights acquired | $ 2.3 |  |

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