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Financial Instruments (Derivative Narrative) (Details) - USD ($) $ in Millions | Jul. 31, 2020 | Jan. 31, 2020
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net gain expected to be recognized in next 24 months | $ (7.1) |
Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, notional amount | 1,180.0 | $ 981.3
Derivatives not designated as hedging instruments | Foreign currency contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, notional amount | $ 182.1 | $ 736.2

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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