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Basis of presentation - Accounting policies (Details) - Accounting Standards Update 2016-16 [Member] - Forecast $ in Millions	Feb. 03, 2018 USD ($)
Accounting standards
Increase in deferred income tax liabilities	$ 32.2
Decrease in retained earnings	$ 32.2

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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