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Retirement plans - Components of Net Periodic Pension Cost (Details) - Pension plan - Foreign Plan - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Apr. 29, 2023
Jan. 28, 2023
Jul. 30, 2022
Apr. 30, 2022
Feb. 03, 2024
Jan. 28, 2023
Jan. 29, 2022
Defined Benefit Plan Disclosure [Line Items]              
Interest cost         $ 0.0 $ (1.0) $ (3.3)
Expected return on UK Plan assets         (2.5) (0.3) 3.0
Amortization of unrecognized actuarial losses         0.0 (3.5) (2.1)
Amortization of unrecognized net prior service costs         0.0 (0.3) (0.1)
Pension settlement loss $ (0.2) $ (0.9) $ (0.9) $ (131.9) (0.2) (133.7) 0.0
Total net periodic benefit cost         (2.7) (138.8) (2.5)
Other changes in assets and benefit obligations recognized in OCI         0.2 137.0 (69.2)
Total recognized in net periodic pension benefit cost and OCI         $ (2.5) $ (1.8) $ (71.7)