Condensed Consolidated Statements Of Shareholders' Equity (Unaudited) - 3 months ended Apr. 29, 2017 - USD ($) $ in Millions	Total	Common shares at par value	Additional paid-in- capital	Other reserves	Treasury shares	Retained earnings	Accumulated other comprehensive (loss) income
Balance at Jan. 28, 2017	$ 2,490.2	$ 15.7	$ 280.7	$ 0.4	$ (1,494.8)	$ 3,995.9	$ (307.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78.5					78.5
Other comprehensive income	2.3						2.3
Dividends on common shares	(21.3)					(21.3)
Dividends on redeemable convertible preferred shares	(8.2)					(8.2)
Net settlement of equity based awards	(0.9)		(5.0)		6.1	(2.0)
Share options exercised	0.1				0.1
Share-based compensation expense	2.7		2.7
Balance at Apr. 29, 2017	$ 2,543.4	$ 15.7	$ 278.4	$ 0.4	$ (1,488.6)	$ 4,042.9	$ (305.4)