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Retirement plans - Components of Net Periodic Pension Cost (Details) - Pension plan - Foreign Plan - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 28, 2023
Apr. 29, 2023
Oct. 29, 2022
Jul. 30, 2022
Apr. 30, 2022
Oct. 28, 2023
Oct. 29, 2022
Defined Benefit Plan Disclosure [Line Items]              
Interest cost $ 0.0   $ 0.0     $ 0.0 $ (0.9)
Expected return on plan assets 0.0   (0.3)     (0.9) 0.0
Amortization of unrecognized actuarial losses 0.0   (1.0)     0.0 (3.0)
Amortization of unrecognized net prior service costs 0.0   (0.1)     0.0 (0.3)
Pension settlement loss 0.0 $ (0.2) (0.9) $ 0.0 $ (131.9) (0.2) (132.8)
Total net periodic benefit cost $ 0.0   $ (1.4)     $ (1.1) $ (137.0)