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Business Combinations - Other Acquisitions Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2017 | Nov. 01, 2016
Series of Individually Immaterial Business Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Consideration paid | $ 14.9 |  |
Cash | $ 9.2 |  |
CWind Limited |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of ownership interest acquired | 60.00% |  | 40.00%
Scenario, Forecast | CWind Limited |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of ownership interest acquired |  | 40.00% |
Construction | PDC Operations (Australia) Pty Ltd (PDC) and BDS VirCon (BDS) |  |  |
Business Acquisition [Line Items] |  |  |
Consideration paid | $ 25.5 |  |
Cash | $ 21.4 |  |

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