Condensed Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jul. 30, 2016	Jan. 30, 2016	Aug. 01, 2015
Statement of Financial Position [Abstract]
Common shares, par value (usd per share)	$ 0.18	$ 0.18	$ 0.18
Common shares, authorized	500,000,000	500,000,000	500,000,000
Common shares, outstanding	75,600,000	79,400,000	79,700,000
Treasury shares, shares	11,600,000	7,800,000	7,500,000
Accumulated depreciation	$ 1,003.1	$ 949.2	$ 915.1