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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2017
Jul. 03, 2016
Jul. 02, 2017
Jul. 03, 2016
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustments, tax expense (benefit) $ 0.0 $ (0.1) $ 0.1 $ 0.1
Unrealized gains (losses) on investments, tax expense (benefit) $ 0.4 $ 7.7 $ 9.0 $ 3.7