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Acquisitions (Narrative) (Details)
$ in Millions
9 Months Ended
Apr. 13, 2018
USD ($)
Sep. 28, 2018
USD ($)
Businesses
Sep. 29, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 1,310.4    
Payments to acquire businesses, net of cash acquired   2,173.3 $ 112.0  
IDT        
Business Acquisition [Line Items]        
Goodwill   1,239.9    
Payments to acquire businesses, net of cash acquired   2,078.2    
IDT | Operating segments | Life Sciences        
Business Acquisition [Line Items]        
Business combination, consideration transferred $ 2,100.0      
Goodwill 1,200.0      
Revenue reported by acquired entity for last annual period $ 260.0      
Business acquisition, transaction costs   15.0   $ 15.0
Series of individually immaterial business acquisitions        
Business Acquisition [Line Items]        
Goodwill   70.5    
Revenue reported by acquired entity for last annual period   $ 26.0    
Number of businesses acquired | Businesses   1    
Payments to acquire businesses, net of cash acquired   $ 95.1    
Fair value adjustment to inventory | IDT        
Business Acquisition [Line Items]        
Fair value adjustments to inventory   $ 1.0 $ (1.0)