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Restructuring, Asset Impairments and Other Charges, net - Summary of Restructuring, Asset Impairments and Other, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Apr. 03, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]        
Restructuring   $ 51.6 $ 24.9 $ 3.9
Asset Impairments   17.5 3.4 4.6
Other   (3.9) 0.4 (4.2)
Total   65.2 28.7 4.3
Property, plant and equipment impairment   9.1    
Impairment of investments   7.0    
Impairment charges for ROU assets   1.4    
Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring   0.0 0.8 3.9
Asset Impairments   17.5 3.4 4.6
Other   (3.9) 0.4 (4.2)
Total   13.6 4.6 $ 4.3
Voluntary separation program | Workforce Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring   27.5    
Asset Impairments   0.0    
Other   0.0    
Total $ 27.5 27.5    
2020 Involuntary separation program | Workforce Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring   11.8    
Asset Impairments   0.0    
Other   0.0    
Total   11.8    
General workforce reduction | Workforce Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring   12.3 8.4  
Asset Impairments   0.0 0.0  
Other   0.0 0.0  
Total   $ 12.3 8.4  
Post-Quantenna acquisition restructuring        
Restructuring Cost and Reserve [Line Items]        
Restructuring     15.7  
Asset Impairments     0.0  
Other     0.0  
Total     $ 15.7