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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
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