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Taxes on Income (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Effective income tax changes by percentage    
Effective tax rate expressed as a percentage of pre-tax earnings 13.70% 9.10%
Effective income tax rate, reduction for foreign tax rate differences including tax holidays 5.00%  
Effective income tax rate reduction for by expense in share based compensation 2.60% 51.00%
Effective income tax rate reduction for federal tax credits 2.40%  
Effective income tax rate (increase) reduction for equity in results of affiliates loss   (13.80%)
Effective income tax rate increase for goodwill impairment   35.30%