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Retirement plans - Future Benefits Payments Estimated to be Paid (Details) - Pension plan - Foreign Plan
$ in Millions
Feb. 01, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2021 $ 9.5
Fiscal 2022 9.6
Fiscal 2023 9.7
Fiscal 2024 9.6
Fiscal 2025 9.9
Thereafter $ 50.6