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Taxes on income from continuing operations (Tables)
6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Effective Income Tax Rate
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
July 1, 2018
 
June 30, 2019
 
July 1, 2018
Effective income tax rate
4.4%
 
136.3%
 
10.6%
 
23.2%