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Net Sales (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Disaggregation of Revenue [Line Items]      
Total net sales $ 1,075.5 $ 1,241.3  
Semiconductor products      
Disaggregation of Revenue [Line Items]      
Total net sales 1,042.5 1,219.1  
Deferred revenue 418.5   $ 597.9
Deferred revenue recognized 62.6 73.8  
Semiconductor products | Accrued liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue, to be recognized within next 12 months 160.1   213.4
Semiconductor products | Other noncurrent liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue, non current 258.4   $ 384.5
Distributors      
Disaggregation of Revenue [Line Items]      
Total net sales 507.0 584.4  
Direct customers      
Disaggregation of Revenue [Line Items]      
Total net sales 535.5 634.7  
Licensees      
Disaggregation of Revenue [Line Items]      
Total net sales 33.0 22.2  
Mixed-signal Microcontrollers      
Disaggregation of Revenue [Line Items]      
Total net sales 532.6 644.7  
Analog      
Disaggregation of Revenue [Line Items]      
Total net sales 316.2 330.6  
Other      
Disaggregation of Revenue [Line Items]      
Total net sales 226.7 $ 266.0  
Long Term Supply Arrangement | Semiconductor products      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 334.3    
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 $ 93.0    
Long Term Supply Arrangement | Semiconductor products | Other noncurrent liabilities      
Disaggregation of Revenue [Line Items]      
Deferred revenue, non current 241.3    
Other Arrangement | Semiconductor products      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 84.2