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Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment reporting information [Line Items] |  |  |  |
Net Sales | $ 1,309.5 | $ 1,337.8 | $ 2,619.2 | $ 2,660.4
Gross Profit | 807.9 | 827.5 | 1,606.2 | 1,642.7
Semiconductor products |  |  |  |
Segment reporting information [Line Items] |  |  |  |
Net Sales | 1,286.2 | 1,314.6 | 2,574.0 | 2,618.6
Gross Profit | 784.6 | 804.3 | 1,561.0 | 1,600.9
Technology licensing |  |  |  |
Segment reporting information [Line Items] |  |  |  |
Net Sales | 23.3 | 23.2 | 45.2 | 41.8
Gross Profit | $ 23.3 | $ 23.2 | $ 45.2 | $ 41.8

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