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Net Sales (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]      
Total net sales $ 8,438.7 $ 6,820.9 $ 5,438.4
Semiconductor products      
Disaggregation of Revenue [Line Items]      
Total net sales 8,277.7 6,698.9 5,335.5
Deferred revenue 757.7 117.6  
Deferred revenue, to be recognized within next 12 months $ 83.0    
Semiconductor products | Contract with customer, initial duration, long term      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, percentage of net sales 55.00%    
Semiconductor products | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Contract with customer, initial duration, long term      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, percentage 85.00%    
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months    
Semiconductor products | Accrued liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 121.4 73.2  
Semiconductor products | Other noncurrent liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue 636.3 44.4  
Distributors      
Disaggregation of Revenue [Line Items]      
Total net sales 3,993.6 3,248.7 2,737.4
Direct customers      
Disaggregation of Revenue [Line Items]      
Total net sales 4,284.1 3,450.2 2,598.1
Licensees      
Disaggregation of Revenue [Line Items]      
Total net sales 161.0 122.0 102.9
Mixed-signal microcontrollers      
Disaggregation of Revenue [Line Items]      
Total net sales 4,755.7 3,814.8 2,961.0
Analog      
Disaggregation of Revenue [Line Items]      
Total net sales 2,376.9 1,939.1 1,519.8
Other      
Disaggregation of Revenue [Line Items]      
Total net sales 1,306.1 $ 1,067.0 $ 957.6
Long Term Supply Arrangement | Semiconductor products      
Disaggregation of Revenue [Line Items]      
Deferred revenue 674.7    
Remaining performance obligation $ 4,180.0    
Long Term Supply Arrangement | Semiconductor products | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, percentage 15.00%    
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months    
Long Term Supply Arrangement | Semiconductor products | Accrued liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 57.5    
Long Term Supply Arrangement | Semiconductor products | Other noncurrent liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue 617.2    
Other Arrangement | Semiconductor products      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 83.0