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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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