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Taxes on income from continuing operations (Tables)
6 Months Ended
Jul. 01, 2018
Income Tax Disclosure [Abstract]  
Effective Income Tax Rate
 
Three Months Ended
 
Six Months Ended
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
Effective income tax rate
136.3%
 
13.4%
 
23.2%
 
7.4%