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Goodwill and intangibles - Composition of Finite-Lived Intangibles (Details) - USD ($) $ in Millions	Aug. 03, 2019	Feb. 02, 2019	Aug. 04, 2018
Intangible assets, net:
Gross carrying amount	$ 53.2	$ 53.3	$ 53.4
Accumulated amortization	(50.7)	(50.1)	(48.6)
Net carrying amount	2.5	3.2	4.8
Intangible assets, gross	529.1	529.2	529.6
Accumulated amortization, net	(264.8)	(264.2)	(188.3)
Total intangible assets, net	264.3	265.0	341.3
Intangible liabilities, net
Gross carrying amount	(113.8)	(113.9)	(114.0)
Accumulated amortization	95.3	92.5	88.8
Total	(18.5)	(21.4)	(25.2)
Trade names
Intangible assets, net:
Indefinite-lived intangible assets, gross	475.9	475.9	476.2
Accumulated amortization	(214.1)	(214.1)	(139.7)
Indefinite-lived intangible assets	$ 261.8	$ 261.8	$ 336.5

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