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Balance Sheet Components (Intangibles, Other Information) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangibles $ 1.7 $ 2.0 $ 3.8 $ 4.2