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Revenue recognition - ESP and Voucher Promotions (Details) - USD ($) $ in Millions	Nov. 02, 2019	Feb. 02, 2019	Nov. 03, 2018
Disaggregation of Revenue [Line Items]
Total deferred revenue	$ 960.5	$ 966.5	$ 924.8
Current liabilities	267.3	270.0	253.1
Non-current liabilities	693.2	696.5	671.7
ESP deferred revenue
Disaggregation of Revenue [Line Items]
Total deferred revenue	919.5	927.6	892.8
Voucher promotions and other
Disaggregation of Revenue [Line Items]
Total deferred revenue	$ 41.0	$ 38.9	$ 32.0

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