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Retirement plans - AOCI Items not yet Recognized (Details) - Pension plan - Foreign Plan - USD ($)
$ in Millions
Jan. 29, 2022
Jan. 30, 2021
Feb. 01, 2020
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial losses $ (103.3) $ (47.2) $ (52.4)
Net prior service costs $ (3.9) $ (4.0) $ (4.1)