Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment reporting information [Line Items]
Net Sales	$ 2,073.2	$ 1,649.8	$ 4,036.8	$ 3,219.2
Gross Profit	1,397.9	1,068.3	2,707.8	2,075.9
Semiconductor products
Segment reporting information [Line Items]
Net Sales	2,028.2	1,617.0	3,953.9	3,159.0
Gross Profit	1,352.9	1,035.5	2,624.9	2,015.7
Technology licensing
Segment reporting information [Line Items]
Net Sales	45.0	32.8	82.9	60.2
Gross Profit	$ 45.0	$ 32.8	$ 82.9	$ 60.2