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New accounting pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 03, 2018 | Oct. 28, 2017 | Nov. 03, 2018 | Oct. 28, 2017 | Feb. 03, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Sales | $ 1,191.7 | $ 1,156.9 | $ 4,092.4 | $ 3,959.9 |
Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Sales | $ 27.6 |  | $ 76.0 |  |
Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Capital lease obligations |  |  |  |  | $ 2,800.0

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