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Fair value measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | May 04, 2019 | Feb. 02, 2019 | May 05, 2018
--- | --- | --- | ---
Quoted prices in active markets for identical assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 10.3 | $ 7.1 | $ 11.6
Liabilities | 0.0 | 0.0 | 0.0
Significant other observable inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 12.5 | 14.9 | 18.1
Liabilities | (0.6) | (0.2) | (1.2)
US Treasury securities | Quoted prices in active markets for identical assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 7.7 | 4.7 | 7.3
US Treasury securities | Significant other observable inputs (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 | Quoted prices in active markets for identical assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 2.6 | 2.4 | 4.3
Corporate equity securities | Significant other observable inputs (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 | Quoted prices in active markets for identical assets (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 | Significant other observable inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 1.0 | 0.9 | 0.4
Liabilities | (0.1) | (0.2) | (1.2)
Commodity contracts | Quoted prices in active markets for identical assets (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
Commodity contracts | Significant other observable inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.9 | 5.7 | 0.1
Liabilities | (0.5) | 0.0 | 0.0
Interest rate swaps | Quoted prices in active markets for identical assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Interest rate swaps | Significant other observable inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.6 | 2.3
US government agency securities | Quoted prices in active markets for identical assets (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 | Significant other observable inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 4.0 | 2.5 | 4.7
Corporate bonds and notes | Quoted prices in active markets for identical assets (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 | Significant other observable inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 6.6 | 5.2 | 10.6
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 22.8 | 22.0 | 29.7
Liabilities | (0.6) | (0.2) | (1.2)
Carrying Value | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 7.7 | 4.7 | 7.3
Carrying Value | Corporate equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 2.6 | 2.4 | 4.3
Carrying Value | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 1.0 | 0.9 | 0.4
Liabilities | (0.1) | (0.2) | (1.2)
Carrying Value | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.9 | 5.7 | 0.1
Liabilities | (0.5) | 0.0 | 0.0
Carrying Value | Interest rate swaps |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.6 | 2.3
Carrying Value | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 4.0 | 2.5 | 4.7
Carrying Value | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 6.6 | $ 5.2 | $ 10.6

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