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Net Sales (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |
Total net sales | $ 1,309.7 | $ 1,322.6
Distributors |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 658.9 | 665.1
Direct customers |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 628.9 | 638.9
Licensees |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 21.9 | 18.6
Microcontrollers |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 716.4 | 708.3
Analog, interface, mixed signal and timing products |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 370.2 | 386.4
Field-programmable gate array products |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 86.8 | 91.0
Licensing, memory and other |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | $ 136.3 | $ 136.9

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