Financial Instruments - Non-Marketable Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2021	Apr. 30, 2020
Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract]
Upward adjustments	$ 0.7	$ 3.0
Negative adjustments, including impairments	(3.7)	(19.1)
Net adjustments	(3.0)	$ (16.1)
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount [Abstract]
Upward adjustments	16.7
Negative adjustments, including impairments	(64.3)
Net adjustments	$ (47.6)

No definition available.

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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

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- Definition

Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value.

+ References

+ Details

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- Definition

Amount of impairment loss on investment in equity security without readily determinable fair value.

+ References

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- Definition

Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

+ References

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- References

No definition available.

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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

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- Definition

Amount of cumulative 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

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