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Stockholders' Equity (Treasury stock activity) (Details) - shares | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Capital Stock |  |
Beginning balance | 118,900,000.0 |
Ending balance | 466,600,000.0 |
Ordinary Shares Issued |  |
Capital Stock |  |
Beginning balance | 119,200,000 | 119,000,000
Net capital increases due to the merger of FMC Technologies and Technip (in shares) | 347,400,000 |
Ending balance | 466,600,000 | 119,000,000
Ordinary Shares Held in Employee Benefit Trust |  |
Capital Stock |  |
Net stock purchased for (sold from) employee benefit trust | 100,000 |
Ending balance | 100,000 |
Treasury Stock |  |
Capital Stock |  |
Beginning balance | 300,000 | 800,000
Net stock purchased for (sold from) employee benefit trust (in shares) |  | (100,000)
Treasury stock cancellation due to the merger of FMC Technologies and Technip (in shares) | (300,000) |
Ending balance |  | 700,000

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