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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Net Sales (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Net Sales (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,186.0	$ 1,026.0	$ 3,401.9	$ 3,431.1
Semiconductor products
Disaggregation of Revenue [Line Items]
Total net sales	1,127.1	995.0	3,277.6	3,339.1
Deferred revenue	345.0		345.0		$ 597.9
Deferred revenue, to be recognized within next 12 months	163.0		163.0		213.4
Deferred revenue, non current	182.0		182.0		$ 384.5
Deferred revenue recognized			120.6	168.2
Distributors
Disaggregation of Revenue [Line Items]
Total net sales	559.3	438.7	1,582.2	1,531.2
Direct customers
Disaggregation of Revenue [Line Items]
Total net sales	567.8	556.3	1,695.4	1,807.9
Licensees
Disaggregation of Revenue [Line Items]
Total net sales	58.9	31.0	124.3	92.0
Mixed-signal Microcontrollers
Disaggregation of Revenue [Line Items]
Total net sales	586.5	533.2	1,703.6	1,772.5
Analog
Disaggregation of Revenue [Line Items]
Total net sales	322.9	272.7	960.6	895.4
Other
Disaggregation of Revenue [Line Items]
Total net sales	276.6	$ 220.1	737.7	$ 763.2
Long Term Supply Arrangement \| Semiconductor products
Disaggregation of Revenue [Line Items]
Deferred revenue	242.6		242.6
Deferred revenue, to be recognized within next 12 months	85.9		85.9
Deferred revenue, non current	156.7		$ 156.7
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
Other Arrangement \| Semiconductor products
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 102.4		$ 102.4