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Acquisitions and Divestitures (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 19, 2016
Sep. 19, 2016
Sep. 29, 2017
Jun. 30, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Dec. 31, 2016
Business Acquisition [Line Items]                
Licensing income       $ 23.9 $ 0.0 $ 23.9 $ 0.0  
Intangible assets, net       708.6   708.6   $ 762.1
Fairchild                
Business Acquisition [Line Items]                
Percentage acquired   100.00%            
Purchase price   $ 2,532.2            
HSET Electronic Tech (Hong Kong) Limited                
Business Acquisition [Line Items]                
Proceeds from divestiture of business $ 75.0     22.5   22.5    
Scenario, Forecast | HSET Electronic Tech (Hong Kong) Limited                
Business Acquisition [Line Items]                
Proceeds from divestiture of business     $ 30.0          
Licensing income     20.0          
Deferred licenses revenue     $ 10.0          
Licensing Agreements | HSET Electronic Tech (Hong Kong) Limited                
Business Acquisition [Line Items]                
Intangible assets, net       $ 8.1   $ 8.1