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Revenue recognition - ESP and Voucher Promotions (Details) - USD ($) $ in Millions	Aug. 03, 2019	Feb. 02, 2019	Aug. 04, 2018
Disaggregation of Revenue [Line Items]
Total deferred revenue	$ 965.2	$ 966.5	$ 939.6
Deferred revenue	265.4	270.0	276.3
Non-current liabilities	699.8	696.5	663.3
ESP deferred revenue
Disaggregation of Revenue [Line Items]
Total deferred revenue	930.2	927.6	906.6
Voucher promotions and other
Disaggregation of Revenue [Line Items]
Total deferred revenue	$ 35.0	$ 38.9	$ 33.0

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