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Fair value measurement - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Jul. 31, 2021 | Jan. 30, 2021 | Aug. 01, 2020
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Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 5.1 | $ 5.7 | $ 6.4
Liabilities | 0.0 | 0.0 | 0.0
Level 1 | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.1 | 5.7 | 6.4
Level 1 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Liabilities | 0.0 | 0.0 | 0.0
Level 1 | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities | 0.0 | 0.0 | 0.0
Level 1 | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Level 1 | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 9.1 | 9.8 | 13.6
Liabilities | (0.2) | (0.4) | 0.0
Level 2 | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Level 2 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.9 | 0.1 | 2.3
Liabilities | (0.2) | (0.3) | 0.0
Level 2 | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities | 0.0 | (0.1) | 0.0
Level 2 | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 2.0 | 3.2 | 3.7
Level 2 | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 6.2 | 6.5 | 7.6
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 14.2 | 15.5 | 20.0
Liabilities | (0.2) | (0.4) | 0.0
Carrying Value | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.1 | 5.7 | 6.4
Carrying Value | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.9 | 0.1 | 2.3
Liabilities | (0.2) | (0.3) | 0.0
Carrying Value | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities | 0.0 | (0.1) | 0.0
Carrying Value | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 2.0 | 3.2 | 3.7
Carrying Value | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 6.2 | $ 6.5 | $ 7.6

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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