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v3.20.1

Financial Instruments (Non-Marketable Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019
Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract] |  |
Upward adjustments | $ 3.0 | $ 0.5
Negative adjustments, including impairments | (19.1) | (3.2)
Net adjustments | (16.1) | $ (2.7)
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount [Abstract] |  |
Upward adjustments | 12.4 |
Negative adjustments, including impairments | (28.1) |
Net adjustments | $ (15.7) |

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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=120269885&loc=SL75117539-209714 + Details
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- Definition Amount of cumulative 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=120269885&loc=SL75117539-209714 + Details
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- Definition Amount of impairment loss 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=120269885&loc=SL75117539-209714 + Details
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- Definition Amount of cumulative impairment loss 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=120269885&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=120269885&loc=SL75117539-209714 + Details
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