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Restructuring Plans - Restructuring and Related Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 84.9 | $ 0.0 | $ 0.0
Non-cash charges | 22.7 |  |
Signet Path to Brillance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 125.9 |  |
Signet Path to Brillance | Cost of sales |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Inventory charges | 62.2 |  |
Signet Path to Brillance | Restructuring charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other Plan related expenses | $ 63.7 |  |

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