Common Shares, Treasury Shares, Reserves and Dividends - Share Repurchase (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014	Jun. 14, 2013	Jan. 28, 2012	Nov. 01, 2011	Oct. 29, 2011
Class of Stock [Line Items]
Shares repurchased (shares)	1,018,568	288,393	1,557,673
Amount repurchased	$ 130.0	$ 29.8	$ 104.7
Average repurchase price per share (usd per share)	$ 127.63	$ 103.37	$ 67.24
2013 Program
Class of Stock [Line Items]
Amount authorized				$ 350.0
Shares repurchased (shares)	1,018,568	288,393	808,428
Amount repurchased	$ 130.0	$ 29.8	$ 54.6
Average repurchase price per share (usd per share)	$ 127.63	$ 103.37	$ 67.54
Remaining authorized repurchase amount	$ 135.6
2011 Program
Class of Stock [Line Items]
Amount authorized					$ 350.0	$ 350.0	$ 300.0
Shares repurchased (shares)			749,245
Amount repurchased			$ 50.1
Average repurchase price per share (usd per share)			$ 66.92