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Financial Instruments - Narrative (Details)
$ in Millions
12 Months Ended
Mar. 31, 2025
USD ($)
Loan
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]        
Impaired loan receivable $ 20.0 $ 19.0    
Level 3        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Convertible loans receivable 34.0 32.0    
Convertible loans receivable | Level 3        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Gains on convertible loan receivable 2.0 1.0    
Loans receivable        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans and other receivables carried at amortized cost 27.0 26.0    
Arduino        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Impaired loan receivable $ 16.6 $ 16.2    
Cerfe Labs, Inc. | Loans receivable        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loan term 4 years 4 years    
Loans and other receivables carried at amortized cost $ 3.2 $ 3.1    
Allia Limited | Loans receivable        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loan term 5 years      
Loans and other receivables carried at amortized cost $ 7.1 6.9    
Number of loans | Loan 2      
Ampere        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Convertible loans receivable       $ 29.0
Ampere | Convertible loans receivable | Level 3        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Gains on convertible loan receivable $ 1.8 $ 1.0 $ 2.0