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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
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