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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
Jan. 28, 2023
Jul. 30, 2022
Apr. 30, 2022
Jan. 28, 2023
Jan. 29, 2022
Jan. 30, 2021
Defined Benefit Plan Disclosure [Line Items]            
Interest cost       $ (1.0) $ (3.3) $ (4.0)
Expected return on UK Plan assets       (0.3) 3.0 5.5
Amortization of unrecognized actuarial losses       (3.5) (2.1) (0.9)
Amortization of unrecognized net prior service costs       (0.3) (0.1) (0.1)
Pension settlement loss $ (0.9) $ (0.9) $ (131.9) (133.7) 0.0 0.0
Total net periodic benefit (cost) income       (138.8) (2.5) 0.5
Other changes in assets and benefit obligations recognized in OCI       137.0 (69.2) 6.5
Total recognized in net periodic pension benefit (cost) income and OCI       $ (1.8) $ (71.7) $ 7.0