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Geographic and Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment reporting information [Line Items]
Net sales	$ 4,401.6	$ 7,634.4	$ 8,438.7
Cost of sales	1,933.7	2,638.7	2,740.8
Gross profit	2,467.9	4,995.7	5,697.9
Semiconductor products
Segment reporting information [Line Items]
Net sales	4,270.5	7,531.1	8,277.7
Cost of sales	1,933.7	2,638.7	2,740.8
Gross profit	2,336.8	4,892.4	5,536.9
Technology licensing
Segment reporting information [Line Items]
Net sales	131.1	103.3	161.0
Cost of sales	0.0	0.0	0.0
Gross profit	$ 131.1	$ 103.3	$ 161.0

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