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New accounting pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017 | Feb. 03, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Sales | $ 1,420.1 | $ 1,399.6 | $ 2,900.7 | $ 2,803.0 |
Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Sales | $ 23.9 |  | $ 48.4 |  |
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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