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Consolidated Statements of Changes in Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Maximum [Member] | Ordinary Shares [Member] |  |  |
Exercise of options by employees and vested RSUs | $ 0.5 | $ 0.5 | $ 0.5

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