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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | May 02, 2020 | Nov. 02, 2019 | Aug. 03, 2019 | Oct. 31, 2020 | Nov. 02, 2019 | Feb. 01, 2020
Goodwill [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | $ 248.8 |  |  | $ 248.8 |  |
Impairment | $ 0.0 |  | $ 0.0 | $ (47.7) | (10.7) | $ (47.7) |
Ending balance | 238.0 |  | $ 248.8 |  | 238.0 | 248.8 | $ 248.8
North America |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 248.8 |  |  | 248.8 | $ 296.6 | 296.6
Impairment |  | $ (10.7) |  |  | (10.7) |  | (47.7)
Impact of foreign exchange and other adjustments |  |  |  |  | (0.1) |  | (0.1)
Ending balance | $ 238.0 |  |  |  | $ 238.0 |  | $ 248.8

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