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Business Acquistions, Goodwill and Acquired Intangible Assets (Goodwill and Intangible Assets Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Jul. 20, 2017
Mar. 28, 2017
Business Acquisition [Line Items]          
Goodwill $ 1,735.2 $ 1,776.7 $ 1,193.5    
Acquired intangibles, net 344.3 398.9      
Amortization of intangible assets 39.5 $ 41.4 $ 28.3    
Amortization expense 2019 29.1        
Amortization expense 2020 27.5        
Amortization expense 2021 26.5        
Amortization expense 2022 23.7        
Amortization expense 2023 $ 19.8        
Minimum          
Business Acquisition [Line Items]          
Useful life 1 year        
Maximum          
Business Acquisition [Line Items]          
Useful life 15 years        
e2v          
Business Acquisition [Line Items]          
Goodwill         $ 494.3
Goodwill, Other Increase (Decrease) $ 3.9        
SSI          
Business Acquisition [Line Items]          
Goodwill       $ 18.6  
Goodwill, Other Increase (Decrease) $ 4.8