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Restructuring, Asset Impairments and Other Charges, net - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 27, 2020
USD ($)
employee
Sep. 27, 2019
employee
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
USD ($)
employee
Dec. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
employee
Mar. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]              
Charges     $ 24.9 $ 3.9      
Payments for restructuring     25.2 5.5      
Accrued liabilities     $ 0.2 $ 0.5 $ 2.1    
General workforce reduction | Employee Severance              
Restructuring Cost and Reserve [Line Items]              
Expected number of positions to be eliminated | employee     143        
Charges     $ 8.4        
General workforce reduction | Employee Severance | Subsequent Event              
Restructuring Cost and Reserve [Line Items]              
Expected number of positions to be eliminated | employee 100            
Charges $ 4.5            
Post-Quantenna acquisition restructuring              
Restructuring Cost and Reserve [Line Items]              
Charges     $ 15.7        
Post-Quantenna acquisition restructuring | Employee Severance              
Restructuring Cost and Reserve [Line Items]              
Number of positions eliminated | employee   8 10        
Post-Fairchild acquisition restructuring costs | Employee Severance              
Restructuring Cost and Reserve [Line Items]              
Expected number of positions to be eliminated | employee       5   225  
Charges         $ 7.9 $ 25.7  
Number of positions eliminated | employee         111    
Total positions eliminated | employee         336    
Number of employees who have exited to date | employee         331    
Total charges expected to incur         $ 35.4    
Payments for restructuring         13.4 $ 20.2  
Accrued liabilities         1.8    
Post-Fairchild acquisition restructuring costs | Other Exit Costs              
Restructuring Cost and Reserve [Line Items]              
Charges         1.8    
Manufacturing relocation | Employee Severance              
Restructuring Cost and Reserve [Line Items]              
Accrued liabilities             $ 2.1
Former System Solutions Group segment voluntary workforce reduction | Workforce Reduction              
Restructuring Cost and Reserve [Line Items]              
Total charges expected to incur         2.2    
Payments for restructuring         $ 2.0    
Number of positions eliminated voluntarily (employee) | employee         36