Geographic and Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Segment reporting information [Line Items]
Net sales	$ 1,186.0	$ 1,026.0	$ 3,401.9	$ 3,431.1
Cost of sales	479.1	464.6	1,480.4	1,464.3
Gross profit	706.9	561.4	1,921.5	1,966.8
Semiconductor products
Segment reporting information [Line Items]
Net sales	1,127.1	995.0	3,277.6	3,339.1
Cost of sales	479.1	464.6	1,480.4	1,464.3
Gross profit	648.0	530.4	1,797.2	1,874.8
Technology licensing
Segment reporting information [Line Items]
Net sales	58.9	31.0	124.3	92.0
Cost of sales	0.0	0.0	0.0	0.0
Gross profit	$ 58.9	$ 31.0	$ 124.3	$ 92.0

The aggregate cost of goods produced and sold and services rendered during the reporting period.

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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