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Fair value measurement - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Aug. 01, 2020 | Feb. 01, 2020 | Aug. 03, 2019
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Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 6.4 | $ 7.2 | $ 11.0
Liabilities | 0.0 | 0.0 | 0.0
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 13.6 | 25.6 | 26.2
Liabilities | 0.0 | (0.9) | (1.1)
US Treasury securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 6.4 | 7.2 | 7.8
US Treasury securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Corporate equity securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 3.2
Corporate equity securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Foreign currency contracts | Level 1 |  |  |
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
Foreign currency contracts | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 2.3 | 0.6 | 1.1
Liabilities | 0.0 | (0.9) | (1.1)
Commodity contracts | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Commodity contracts | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 11.8 | 9.9
US government agency securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
US government agency securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 3.7 | 4.7 | 5.8
Corporate bonds and notes | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Corporate bonds and notes | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 7.6 | 8.5 | 9.4
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 20.0 | 32.8 | 37.2
Liabilities | 0.0 | (0.9) | (1.1)
Carrying Value | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 6.4 | 7.2 | 7.8
Carrying Value | Corporate equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 3.2
Carrying Value | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 2.3 | 0.6 | 1.1
Liabilities | 0.0 | (0.9) | (1.1)
Carrying Value | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 11.8 | 9.9
Carrying Value | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 3.7 | 4.7 | 5.8
Carrying Value | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 7.6 | $ 8.5 | $ 9.4

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