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New accounting pronouncements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 02, 2019 | Nov. 03, 2018 | Aug. 04, 2018 | May 05, 2018 | Feb. 03, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017 | Feb. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ 2,154.7 | $ 1,191.7 | $ 1,420.1 | $ 1,480.6 | $ 2,293.1 | $ 1,156.9 | $ 1,399.6 | $ 1,403.4 | $ 6,247.1 | $ 6,253.0 | $ 6,408.4 |
Impact from adoption of new accounting pronouncements | [1] |  |  |  |  | $ (16.5) |  |  |  |  | $ (16.5) |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 111.2 |  |  |
Impact from adoption of new accounting pronouncements |  | $ (16.5) |  |  |  |  |  |  |  | $ (16.5) |  |  |
Minimum | Scenario, Forecast | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800.0
Operating lease, liability |  |  |  |  |  |  |  |  |  |  |  |  | 1,800.0
Maximum | Scenario, Forecast | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  |  | 2,200.0
Operating lease, liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200.0
[1] | Adjustments reflect reclassifications to retained earnings related to 1) deferred costs associated with the sale of extended service plans due to the adoption of ASU 2014-09 and 2) unrealized gains related to the Company’s equity security investments as of February 3, 2018 from AOCI associated with the adoption of ASU 2016-01.

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