Geographic and Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Segment reporting information [Line Items]
Net Sales	$ 7,634.4	$ 8,438.7	$ 6,820.9
Gross Profit	4,995.7	5,697.9	4,449.6
Semiconductor products
Segment reporting information [Line Items]
Net Sales	7,531.1	8,277.7	6,698.9
Gross Profit	4,892.4	5,536.9	4,327.6
Technology licensing
Segment reporting information [Line Items]
Net Sales	103.3	161.0	122.0
Gross Profit	$ 103.3	$ 161.0	$ 122.0