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Goodwill and intangibles - Composition of Finite-Lived Intangibles (Details) - USD ($) $ in Millions	Oct. 28, 2017	Jan. 28, 2017	Oct. 29, 2016
Definite-lived intangible assets:
Gross carrying amount	$ 49.4	$ 49.0	$ 48.9
Accumulated amortization	(45.1)	(36.8)	(33.3)
Net carrying amount	4.3	12.2	15.6
Intangible assets, gross	455.5	453.8	453.1
Total intangible assets, net	410.4	417.0	419.8
Definite-lived intangible liabilities:
Gross carrying amount	(114.1)	(113.9)	(113.7)
Accumulated amortization	83.0	71.7	66.8
Total	(31.1)	(42.2)	(46.9)
Unfavorable leases
Definite-lived intangible liabilities:
Gross carrying amount	(48.5)	(48.3)	(48.1)
Accumulated amortization	45.4	38.2	34.7
Total	(3.1)	(10.1)	(13.4)
Unfavorable contracts
Definite-lived intangible liabilities:
Gross carrying amount	(65.6)	(65.6)	(65.6)
Accumulated amortization	37.6	33.5	32.1
Total	(28.0)	(32.1)	(33.5)
Trade names
Definite-lived intangible assets:
Gross carrying amount	1.5	1.4	1.4
Accumulated amortization	(1.0)	(0.8)	(0.7)
Net carrying amount	0.5	0.6	0.7
Favorable leases
Definite-lived intangible assets:
Gross carrying amount	47.9	47.6	47.5
Accumulated amortization	(44.1)	(36.0)	(32.6)
Net carrying amount	3.8	11.6	14.9
Trade names
Definite-lived intangible assets:
Indefinite-lived trade names	$ 406.1	$ 404.8	$ 404.2

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