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Net Sales (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]      
Total net sales $ 4,401.6 $ 7,634.4 $ 8,438.7
Semiconductor products      
Disaggregation of Revenue [Line Items]      
Total net sales 4,270.5 7,531.1 8,277.7
Deferred revenue 597.9 933.0  
Deferred revenue recognized 217.2 126.1  
Semiconductor products | Accrued liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue, to be recognized within next 12 months 213.4 261.8  
Semiconductor products | Other noncurrent liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue, non current 384.5 671.2  
Distributors      
Disaggregation of Revenue [Line Items]      
Total net sales 1,970.0 3,620.8 3,993.6
Direct customers      
Disaggregation of Revenue [Line Items]      
Total net sales 2,300.5 3,910.3 4,284.1
Licensees      
Disaggregation of Revenue [Line Items]      
Total net sales 131.1 103.3 161.0
Mixed-signal Microcontrollers      
Disaggregation of Revenue [Line Items]      
Total net sales 2,249.7 4,272.4 4,755.7
Analog      
Disaggregation of Revenue [Line Items]      
Total net sales 1,157.0 2,016.4 2,376.9
Other      
Disaggregation of Revenue [Line Items]      
Total net sales 994.9 $ 1,345.6 $ 1,306.1
Long Term Supply Arrangement | Semiconductor products      
Disaggregation of Revenue [Line Items]      
Deferred revenue 501.5    
Remaining performance obligation $ 2,520.0    
Long Term Supply Arrangement | Semiconductor products | Minimum      
Disaggregation of Revenue [Line Items]      
Contract liability period 3 years    
Long Term Supply Arrangement | Semiconductor products | Maximum      
Disaggregation of Revenue [Line Items]      
Contract liability period 5 years    
Long Term Supply Arrangement | Semiconductor products | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, percentage 28.00%    
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, to be recognized within next 12 months $ 138.3    
Long Term Supply Arrangement | Semiconductor products | Other noncurrent liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue, non current 363.2    
Other Arrangement | Semiconductor products      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 96.4