Condensed Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Oct. 31, 2015	Jan. 31, 2015	Nov. 01, 2014
Statement of Financial Position [Abstract]
Common shares, par value (usd per share)	$ 0.18	$ 0.18	$ 0.18
Common shares, authorized	500.0	500.0	500.0
Common shares, outstanding	79.5	80.3	80.2
Treasury shares, shares	7.7	6.9	7.0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 939.7	$ 852.1	$ 839.0