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Revenue recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,420.1 | $ 1,399.6 | $ 2,900.7 | $ 2,803.0
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,286.7 | 1,262.2 | 2,634.5 | 2,536.6
International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 131.5 | 131.9 | 260.2 | 254.4
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1.9 | 5.5 | 6.0 | 12.0
Bridal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 636.9 | 571.2 | 1,310.4 | 1,187.2
Bridal | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 585.1 | 518.6 | 1,203.0 | 1,081.5
Bridal | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 51.8 | 52.6 | 107.4 | 105.7
Bridal | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Fashion |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 447.7 | 430.0 | 934.7 | 906.7
Fashion | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 420.5 | 400.8 | 881.6 | 851.7
Fashion | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 27.2 | 29.2 | 53.1 | 55.0
Fashion | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Watches |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 104.8 | 99.1 | 196.1 | 187.1
Watches | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 58.0 | 55.1 | 110.2 | 106.6
Watches | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 46.8 | 44.0 | 85.9 | 80.5
Watches | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 230.7 | 299.3 | 459.5 | 522.0
Other | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 223.1 | 287.7 | 439.7 | 496.8
Other | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5.7 | 6.1 | 13.8 | 13.2
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1.9 | 5.5 | 6.0 | 12.0
Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,267.9 | 1,311.9 | 2,597.9 | 2,627.8
Store | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,150.2 | 1,191.5 | 2,363.9 | 2,394.8
Store | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 117.7 | 120.4 | 234.0 | 233.0
Store | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
E-commerce |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 150.3 | 82.2 | 296.8 | 163.2
E-commerce | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 136.5 | 70.7 | 270.6 | 141.8
E-commerce | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13.8 | 11.5 | 26.2 | 21.4
E-commerce | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1.9 | 5.5 | 6.0 | 12.0
Other | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Other | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1.9 | $ 5.5 | 6.0 | $ 12.0
James Allen | E-commerce | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 54.4 |  | $ 107.7 |

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