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Intangible Assets and Goodwill - Goodwill (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) unit
Goodwill [Roll Forward] |  |
Goodwill | $ 2,299.0 |
Goodwill | 6,782.0 | $ 2,299.0
Number of reporting units (in units) | unit |  | 2
Semiconductor products |  |
Goodwill [Roll Forward] |  |
Goodwill | 2,279.8 |
Additions due to the acquisition of Microsemi | 4,483.0 |
Goodwill | 6,762.8 | $ 2,279.8
Technology licensing |  |
Goodwill [Roll Forward] |  |
Goodwill | 19.2 |
Additions due to the acquisition of Microsemi | 0.0 |
Goodwill | $ 19.2 | $ 19.2

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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- Details
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