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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 03, 2018 | Oct. 28, 2017 | Nov. 03, 2018 | Oct. 28, 2017 | Feb. 03, 2018 | Sep. 12, 2017 | Jan. 28, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | $ 509.0 | $ 867.1 | $ 509.0 | $ 867.1 | $ 821.7 |  | $ 517.6
Goodwilll, acquired during period |  |  |  | 301.7 |  |  |
Goodwill and intangible impairments | 0.0 | $ 0.0 | 448.7 | $ 0.0 |  |  |
Impairment |  |  | $ 308.8 |  |  |  |
R2Net Inc. |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 299.1 |
Sterling Jewelers |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment | 23.2 |  |  |  |  |  |
Zale Jewelry |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment | 285.6 |  |  |  |  |  |
Impairment of intangible assets (excluding goodwill) | $ 139.9 |  |  |  |  |  |

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