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Restructuring Plans - Restructuring and Related Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 33 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Nov. 02, 2019 | Oct. 31, 2020 | Nov. 02, 2019 | Oct. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 3.6 | $ 9.2 | $ 45.2 | $ 59.4 |
Cost of sales |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Inventory charges | 2.0 | 1.4 | 1.4 | 5.8 |
Restructuring Charges |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 3.6 | 9.2 | 45.2 | 59.4 |
Signet Path to Brillance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 5.6 | $ 10.6 | 46.6 | $ 65.2 | $ 251.6
Inventory charges | Signet Path to Brillance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 2.0 |  | 1.4 |  | 72.8
Termination benefits | Signet Path to Brillance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 2.3 |  | 25.4 |  | 51.2
Store closure and other costs | Signet Path to Brillance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 1.3 |  | $ 19.8 |  | $ 127.6

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