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Goodwill and intangibles - Composition of Finite-Lived Intangibles (Details) - USD ($) $ in Millions	May 02, 2020	Feb. 01, 2020	May 04, 2019
Intangible assets, net:
Gross carrying amount	$ 52.4	$ 53.2	$ 53.0
Accumulated amortization	(50.4)	(50.9)	(50.2)
Net carrying amount	2.0	2.3	2.8
Indefinite-lived intangible assets, gross	472.4	475.4	475.1
Accumulated amortization	(295.7)	(213.9)	(213.8)
Indefinite-lived intangible assets	176.7	261.5	261.3
Intangible assets, gross	524.8	528.6	528.1
Accumulated amortization, net	(346.1)	(264.8)	(264.0)
Total intangible assets, net	178.7	263.8	264.1
Intangible liabilities, net
Gross carrying amount	(113.2)	(113.9)	(113.7)
Accumulated amortization	98.7	98.0	93.8
Total	$ (14.5)	$ (15.9)	$ (19.9)

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