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Net Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Disaggregation of Revenue [Line Items]          
Total net sales $ 1,765.7 $ 2,169.2 $ 6,308.6 $ 6,206.0  
Semiconductor products          
Disaggregation of Revenue [Line Items]          
Total net sales 1,741.5 2,124.8 6,224.0 6,078.7  
Deferred revenue 907.2   907.2   $ 757.7
Deferred revenue recognized     82.5    
Semiconductor products | Accrued liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, to be recognized within next 12 months 203.2   203.2   121.4
Semiconductor products | Other noncurrent liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, non current 704.0   704.0   $ 636.3
Distributors          
Disaggregation of Revenue [Line Items]          
Total net sales 767.6 1,032.3 3,001.6 2,903.7  
Direct customers          
Disaggregation of Revenue [Line Items]          
Total net sales 973.9 1,092.5 3,222.4 3,175.0  
Licensees          
Disaggregation of Revenue [Line Items]          
Total net sales 24.2 44.4 84.6 127.3  
Mixed-signal Microcontrollers          
Disaggregation of Revenue [Line Items]          
Total net sales 995.2 1,221.3 3,577.0 3,463.8  
Analog          
Disaggregation of Revenue [Line Items]          
Total net sales 430.6 606.5 1,687.2 1,759.0  
Other          
Disaggregation of Revenue [Line Items]          
Total net sales 339.9 $ 341.4 1,044.4 $ 983.2  
Long Term Supply Arrangement | Semiconductor products          
Disaggregation of Revenue [Line Items]          
Deferred revenue 868.5   868.5    
Remaining performance obligation $ 3,920.0   $ 3,920.0    
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 24.00%   24.00%    
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 $ 168.6   $ 168.6    
Long Term Supply Arrangement | Semiconductor products | Other noncurrent liabilities          
Disaggregation of Revenue [Line Items]          
Deferred revenue, non current 699.9   699.9    
Other Arrangement | Semiconductor products          
Disaggregation of Revenue [Line Items]          
Deferred revenue 38.7   38.7    
Deferred revenue, to be recognized within next 12 months $ 38.7   $ 38.7