Income Taxes - Summary of Income and Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Income before income taxes:
– US	$ 424.0	$ 426.1	$ 380.8
– Foreign	289.8	231.7	159.8
Income before income taxes	713.8	657.8	540.6
Current taxation:
– US	137.6	161.7	199.5
– Foreign	3.9	3.5	7.8
Deferred taxation:
– US	28.1	22.3	(47.9)
– Foreign	1.0	2.4	(0.1)
Total income taxes	$ 170.6	$ 189.9	$ 159.3