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Net Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Disaggregation of Revenue [Line Items]          
Total net sales $ 1,140.4 $ 1,163.8 $ 2,215.9 $ 2,405.1  
Semiconductor products          
Disaggregation of Revenue [Line Items]          
Total net sales 1,108.0 1,125.0 2,150.5 2,344.1  
Deferred revenue 385.8   385.8   $ 597.9
Deferred revenue recognized     98.6 129.9  
Semiconductor products | Accrued liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, to be recognized within next 12 months 160.0   160.0   213.4
Semiconductor products | Other noncurrent liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, non current 225.8   225.8   $ 384.5
Distributors          
Disaggregation of Revenue [Line Items]          
Total net sales 515.9 508.1 1,022.9 1,092.5  
Direct customers          
Disaggregation of Revenue [Line Items]          
Total net sales 592.1 616.9 1,127.6 1,251.6  
Licensees          
Disaggregation of Revenue [Line Items]          
Total net sales 32.4 38.8 65.4 61.0  
Mixed-signal Microcontrollers          
Disaggregation of Revenue [Line Items]          
Total net sales 584.5 594.6 1,117.1 1,239.3  
Analog          
Disaggregation of Revenue [Line Items]          
Total net sales 321.5 292.1 637.7 622.7  
Other          
Disaggregation of Revenue [Line Items]          
Total net sales 234.4 $ 277.1 461.1 $ 543.1  
Long Term Supply Arrangement | Semiconductor products          
Disaggregation of Revenue [Line Items]          
Deferred revenue 291.5   $ 291.5    
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 | Accrued liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, to be recognized within next 12 months 88.8   $ 88.8    
Long Term Supply Arrangement | Semiconductor products | Other noncurrent liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, non current 202.7   202.7    
Other Arrangement | Semiconductor products          
Disaggregation of Revenue [Line Items]          
Deferred revenue $ 94.3   $ 94.3