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Goodwill and intangibles - Composition of Finite-Lived Intangibles (Details) - USD ($)
$ in Millions
May 01, 2021
Jan. 30, 2021
May 02, 2020
Intangible assets, net:      
Gross carrying amount $ 17.1 $ 5.6 $ 5.6
Accumulated amortization (4.6) (4.2) (3.6)
Net carrying amount 12.5 1.4 2.0
Indefinite-lived intangible assets 178.1 177.6 176.7
Intangible assets, gross 195.2 183.2 182.3
Accumulated amortization, net (4.6) (4.2) (3.6)
Total intangible assets, net 190.6 179.0 178.7
Intangible liabilities, net      
Gross carrying amount (38.0) (38.0) (38.0)
Accumulated amortization 29.0 27.5 23.5
Total (9.0) (10.5) (14.5)
Accumulated impairment losses $ 297.5 $ 297.5 $ 297.5