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Revenue recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total sales | $ 6,247.1 | $ 6,253.0 | $ 6,408.4
Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 5,535.8 | 5,734.2 | 6,027.2
eCommerce |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 682.4 | 497.7 | 363.1
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 28.9 | 21.1 | 18.1
North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 5,641.7 | 5,615.2 | 5,743.2
North America | Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 5,022.4 | 5,176.7 | 5,432.0
North America | eCommerce |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 619.3 | 438.5 | 311.2
North America | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 0.0 | 0.0 | 0.0
International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 576.5 | 616.7 | 647.1
International | Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 513.4 | 557.5 | 595.2
International | eCommerce |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 63.1 | 59.2 | 51.9
International | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 0.0 | 0.0 | 0.0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 28.9 | 21.1 | 18.1
Other | Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 0.0 | 0.0 | 0.0
Other | eCommerce |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 0.0 | 0.0 | 0.0
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 28.9 | 21.1 | 18.1
Bridal |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 2,712.6 | 2,654.6 | 2,695.6
Bridal | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 2,478.6 | 2,407.3 | 2,429.0
Bridal | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 234.0 | 247.3 | 266.6
Bridal | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 0.0 | 0.0 | 0.0
Fashion |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 2,254.4 | 2,305.2 | 2,341.7
Fashion | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 2,128.1 | 2,168.2 | 2,190.8
Fashion | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 126.3 | 137.0 | 150.9
Fashion | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 0.0 | 0.0 | 0.0
Watches |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 429.1 | 439.1 | 462.6
Watches | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 238.2 | 243.6 | 263.0
Watches | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 190.9 | 195.5 | 199.6
Watches | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 0.0 | 0.0 | 0.0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 851.0 | 854.1 | 908.5
Other | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 796.8 | 796.1 | 860.4
Other | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 25.3 | 36.9 | 30.0
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | 28.9 | 21.1 | $ 18.1
James Allen | North America | eCommerce |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total sales | $ 223.7 | $ 88.1 |

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