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Summary of Significant Accounting Policies (Acquisitions and Divestitures) (Details) - USD ($)
$ in Millions
Jun. 29, 2018
Jul. 31, 2017
Dec. 24, 2014
Feb. 28, 2011
SoLayTec, B.V.        
Business Acquisition [Line Items]        
Percentage of voting interests acquired   49.00% 51.00%  
Kingstone Hong Kong        
Business Acquisition [Line Items]        
Percentage of voting interests acquired       55.00%
Kingstone Hong Kong        
Business Acquisition [Line Items]        
Remaining ownership percentage disposed of 15.00%      
Proceeds from sale of business $ 5.7