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Consolidated Statements of Changes in Equity (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
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