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Net Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Disaggregation of Revenue [Line Items]          
Total net sales $ 2,254.3 $ 2,073.2 $ 4,542.9 $ 4,036.8  
Semiconductor products          
Disaggregation of Revenue [Line Items]          
Total net sales 2,227.7 2,028.2 4,482.5 3,953.9  
Deferred revenue $ 899.0   899.0   $ 757.7
Deferred revenue recognized     $ 62.6    
Semiconductor products | Contract with customer, initial duration, long term          
Disaggregation of Revenue [Line Items]          
Revenue, remaining performance obligation, percentage of net sales 20.00%   20.00%    
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%   85.00%    
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months   12 months    
Semiconductor products | Accrued liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, to be recognized within next 12 months $ 175.7   $ 175.7   121.4
Semiconductor products | Other noncurrent liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, non current 723.3   723.3   $ 636.3
Distributors          
Disaggregation of Revenue [Line Items]          
Total net sales 1,126.1 958.3 2,234.0 1,871.4  
Direct customers          
Disaggregation of Revenue [Line Items]          
Total net sales 1,101.6 1,069.9 2,248.5 2,082.5  
Licensees          
Disaggregation of Revenue [Line Items]          
Total net sales 26.6 45.0 60.4 82.9  
Mixed-signal Microcontrollers          
Disaggregation of Revenue [Line Items]          
Total net sales 1,280.1 1,179.5 2,581.8 2,242.5  
Analog          
Disaggregation of Revenue [Line Items]          
Total net sales 623.0 572.5 1,256.6 1,152.5  
Other          
Disaggregation of Revenue [Line Items]          
Total net sales 351.2 $ 321.2 704.5 $ 641.8  
Long Term Supply Arrangement | Semiconductor products          
Disaggregation of Revenue [Line Items]          
Deferred revenue 857.7   857.7    
Remaining performance obligation $ 4,120.0   $ 4,120.0    
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 22.00%   22.00%    
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months   12 months    
Long Term Supply Arrangement | Semiconductor products | Accrued liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, to be recognized within next 12 months $ 138.4   $ 138.4    
Long Term Supply Arrangement | Semiconductor products | Other noncurrent liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, non current 719.3   719.3    
Other Arrangement | Semiconductor products          
Disaggregation of Revenue [Line Items]          
Deferred revenue 41.3   41.3    
Deferred revenue, to be recognized within next 12 months $ 41.3   $ 41.3