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Financial Instruments - Non-Marketable Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020
Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract] |  |  |
Upward adjustments | $ 7.2 | $ 6.6 | $ 3.2
Negative adjustments, including impairments | (16.6) | (51.6) | (4.2)
Net adjustments | (9.4) | $ (45.0) | $ (1.0)
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount [Abstract] |  |  |
Upward adjustments | 23.2 |  |
Negative adjustments, including impairments | (77.2) |  |
Net adjustments | $ (54.0) |  |

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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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