Income Taxes - Summary of Income and Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Income before income taxes:
– US	$ 202.2	$ 424.0	$ 426.1
– Foreign	325.0	289.8	231.7
Income before income taxes	527.2	713.8	657.8
Current taxation:
– US	35.9	137.6	161.7
– Foreign	6.1	3.9	3.5
Deferred taxation:
– US	(34.8)	28.1	22.3
– Foreign	0.7	1.0	2.4
Total income taxes	$ 7.9	$ 170.6	$ 189.9