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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 29, 2018
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Goodwill [Line Items]        
Asset impairments   $ 8.7 $ 0.0 $ 0.0
Amortization   54.9 $ 55.2 $ 62.0
Impairment Charges   17.3    
Goodwill | Hermetic Climate | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Goodwill [Line Items]        
Asset impairments   9.5    
Customer Relationships        
Goodwill [Line Items]        
Amortization   43.5    
Impairment Charges   5.3    
Customer Relationships | Hermetic Climate        
Goodwill [Line Items]        
Impairment Charges $ 5.5      
Customer Relationships | Hermetic Climate | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Goodwill [Line Items]        
Asset impairments   5.5    
Technology        
Goodwill [Line Items]        
Amortization   9.5    
Impairment Charges   12.0    
Technology | Hermetic Climate        
Goodwill [Line Items]        
Impairment Charges $ 2.1      
Technology | Hermetic Climate | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Goodwill [Line Items]        
Asset impairments   $ 2.1