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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impaired loan receivable   $ 19.0 $ 22.0    
Non-cash distribution, disposal of investment   0.0 0.0 $ 980.0  
Level 3          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Convertible loans receivable   32.0 31.0    
Convertible loans receivable | Level 3          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Fair value losses recognized in the Consolidated Income Statements   1.0 2.0    
Loans receivable          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loan receivable   26.0 25.0    
Other receivables          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loan receivable   12.0 18.0    
Arduino          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impaired loan receivable   16.2 19.2    
Cerfe Labs, Inc. | Loans receivable          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loan receivable   $ 3.1 $ 3.0    
Loan term   4 years 4 years    
Allia Limited | Loans receivable          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loan receivable   $ 6.9 $ 3.1    
Loan term   5 years 5 years    
IoTP          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Non-cash distribution, disposal of investment $ 12.0 $ 12.0      
IoTP | Other receivables          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loan receivable     $ 12.0    
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]          
Fair value losses recognized in the Consolidated Income Statements   $ 1.0 $ 2.0 $ 0.0