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Geographic and Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment reporting information [Line Items]
Net sales	$ 1,140.4	$ 1,163.8	$ 2,215.9	$ 2,405.1
Cost of sales	502.5	495.3	1,001.3	999.7
Gross profit	637.9	668.5	1,214.6	1,405.4
Semiconductor products
Segment reporting information [Line Items]
Net sales	1,108.0	1,125.0	2,150.5	2,344.1
Cost of sales	502.5	495.3	1,001.3	999.7
Gross profit	605.5	629.7	1,149.2	1,344.4
Technology licensing
Segment reporting information [Line Items]
Net sales	32.4	38.8	65.4	61.0
Cost of sales	0.0	0.0	0.0	0.0
Gross profit	$ 32.4	$ 38.8	$ 65.4	$ 61.0

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