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Geographic and Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Segment reporting information [Line Items]
Net sales	$ 1,075.5	$ 1,241.3
Cost of sales	498.8	504.4
Gross profit	576.7	736.9
Semiconductor products
Segment reporting information [Line Items]
Net sales	1,042.5	1,219.1
Cost of sales	498.8	504.4
Gross profit	543.7	714.7
Technology licensing
Segment reporting information [Line Items]
Net sales	33.0	22.2
Cost of sales	0.0	0.0
Gross profit	$ 33.0	$ 22.2

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