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Fair value measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Aug. 03, 2019 | Feb. 02, 2019 | Aug. 04, 2018
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Quoted prices in active markets for identical assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 11.0 | $ 7.1 | $ 7.6
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 | 26.2 | 14.9 | 11.3
Liabilities | (1.1) | (0.2) | (5.8)
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 | 7.8 | 4.7 | 5.1
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 | 3.2 | 2.4 | 2.5
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 | 1.1 | 0.9 | 1.1
Liabilities | (1.1) | (0.2) | (0.8)
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 | 9.9 | 5.7 | 0.0
Liabilities | 0.0 | 0.0 | (5.0)
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 | 1.9
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 | 5.8 | 2.5 | 2.9
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 | 9.4 | 5.2 | 5.4
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 37.2 | 22.0 | 18.9
Liabilities | (1.1) | (0.2) | (5.8)
Carrying Value | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 7.8 | 4.7 | 5.1
Carrying Value | Corporate equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 3.2 | 2.4 | 2.5
Carrying Value | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 1.1 | 0.9 | 1.1
Liabilities | (1.1) | (0.2) | (0.8)
Carrying Value | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 9.9 | 5.7 | 0.0
Liabilities | 0.0 | 0.0 | (5.0)
Carrying Value | Interest rate swaps |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.6 | 1.9
Carrying Value | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.8 | 2.5 | 2.9
Carrying Value | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 9.4 | $ 5.2 | $ 5.4

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