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Restructuring plans - Restructuring and Related Costs (Details) - USD ($) $ in Millions | 12 Months Ended | 48 Months Ended
--- | --- | ---
Jan. 29, 2022 | Jan. 30, 2021 | Feb. 01, 2020 | Jan. 29, 2022
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ (3.3) | $ 46.2 | $ 69.9 |
Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | (3.3) | 47.6 | 79.1 | $ 249.3
Signet Path to Brillance | Cost of sales |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory charges | 0.0 | 1.4 | 9.2 |
Signet Path to Brillance | Restructuring charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other Plan related expenses | (3.3) | 46.2 | 69.9 |
Inventory charges | Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 0.0 | 1.4 | 9.2 | 72.8
Termination benefits | Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | (1.1) | 24.1 | 16.1 | 48.8
Store closure and other costs | Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ (2.2) | $ 22.1 | $ 53.8 | $ 127.7

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