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Fair value measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Oct. 28, 2017 | Jan. 28, 2017 | Oct. 29, 2016
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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 | $ 11.8 | $ 11.9 | $ 11.9
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 | 19.1 | 18.9 | 19.7
Liabilities | (1.3) | (3.6) | (3.1)
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 | 8.1 | 8.3
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 | 4.1 | 3.8 | 3.6
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 | 0.2 | 3.2 | 3.5
Liabilities | (1.3) | (0.2) | (0.1)
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 | 0.7 | 0.0 | 0.6
Liabilities | 0.0 | (3.4) | (0.7)
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
Liabilities | 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 | 1.3 | 0.4 | 0.0
Liabilities | 0.0 | 0.0 | (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 | 5.4 | 4.4 | 4.5
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 | 11.5 | 10.9 | 11.1
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 30.9 | 30.8 | 31.6
Liabilities | (1.3) | (3.6) | (3.1)
Carrying Value | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 7.7 | 8.1 | 8.3
Carrying Value | Corporate equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 4.1 | 3.8 | 3.6
Carrying Value | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.2 | 3.2 | 3.5
Liabilities | (1.3) | (0.2) | (0.1)
Carrying Value | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.7 | 0.0 | 0.6
Liabilities | 0.0 | (3.4) | (0.7)
Carrying Value | Interest rate swaps |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 1.3 | 0.4 | 0.0
Liabilities | 0.0 | 0.0 | (2.3)
Carrying Value | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.4 | 4.4 | 4.5
Carrying Value | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 11.5 | $ 10.9 | $ 11.1

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