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Taxes on income from continuing operations (Tables)
9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Effective Income Tax Rate
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2018
 
October 1, 2017
 
September 30, 2018
 
October 1, 2017
Effective income tax rate
(2.3)%
 
11.2%
 
11.8%
 
8.9%