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Retirement plans - AOCI Items not yet Recognized (Details) - Pension plan - Foreign Plan - USD ($)
$ in Millions
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial losses $ (52.4) $ (53.8) $ (51.1)
Net prior service (costs) credits $ (4.1) $ (4.1) $ 2.4