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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 04, 2018 | Aug. 04, 2018 | Jul. 29, 2017
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | $ 821.7 | $ 517.6
Acquisitions |  |  | 301.7
Impairment |  | (308.8) |
Impact of foreign exchange and other adjustments |  | (3.9) | 2.4
Ending Balance | $ 509.0 | 509.0 | 519.9
Intangible assets, purchase accounting adjustments | 2.6 |  |
North America |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | 818.1 | 514.0
Acquisitions |  |  | 301.7
Impairment |  | (308.8) |
Impact of foreign exchange and other adjustments |  | (3.9) | 2.4
Ending Balance | 505.4 | 505.4 |
Other |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | 3.6 | 3.6
Acquisitions |  |  | 0.0
Impairment |  | 0.0 |
Impact of foreign exchange and other adjustments |  | 0.0 | $ 0.0
Ending Balance | $ 3.6 | $ 3.6 |

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