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Special Charges and Other, Net - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Employee separation costs $ 12.1 $ 0.3 $ 57.2 $ 1.4
Contract exit costs $ 4.0 19.6 (3.0) 20.2
Supply commitment, period 10 years      
Gain on sale of assets $ 0.0 0.0 0.0 $ 4.4
Contract termination        
Restructuring Cost and Reserve [Line Items]        
Incurred cost   19.5    
Contract termination fee, period 5 years      
Semiconductor products        
Restructuring Cost and Reserve [Line Items]        
Employee separation costs $ 12.1      
Contract exit costs 4.0      
Semiconductor products | Contract termination        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs incurred to date 42.5   42.5  
Semiconductor products | Employee Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs incurred to date $ 107.1   $ 107.1  
Micrel Incorporated        
Restructuring Cost and Reserve [Line Items]        
Proceeds from sale of property, plant, and equipment   10.0    
San Jose Facility | Micrel Incorporated        
Restructuring Cost and Reserve [Line Items]        
Gain on sale of assets   $ 4.4