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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
May 05, 2018 | Apr. 29, 2017
Goodwill [Roll Forward] |  |
Beginning Balance | $ 821.7 | $ 517.6
Acquisitions |  | 301.7
Impairment | (308.8) |
Impact of foreign exchange and other adjustments | (3.8) | 2.4
Ending Balance | 509.1 | 516.1
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 | (3.8) | 2.4
Ending Balance | 505.5 |
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 |

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