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Geographic and Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Net Sales | $ 1,002.3 | $ 994.2 | $ 1,012.1 | $ 972.1 | $ 902.7 | $ 834.4 | $ 871.4 | $ 799.4 | $ 3,980.8 | $ 3,407.8 | $ 2,173.3
Segment Gross Profit | $ 615.1 | $ 607.1 | $ 614.1 | $ 584.4 | $ 532.8 | $ 465.3 | $ 410.6 | $ 348.5 | 2,420.7 | 1,757.2 | 1,205.5
Semiconductor products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Net Sales |  |  |  |  |  |  |  |  | 3,876.0 | 3,316.6 | 2,084.2
Segment Gross Profit |  |  |  |  |  |  |  |  | 2,315.9 | 1,666.0 | 1,116.4
Technology licensing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Net Sales |  |  |  |  |  |  |  |  | 104.8 | 91.2 | 89.1
Segment Gross Profit |  |  |  |  |  |  |  |  | $ 104.8 | $ 91.2 | $ 89.1

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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