Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jul. 29, 2017	Apr. 29, 2017	Jul. 30, 2016	Apr. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Income Statement [Abstract]
Sales	$ 1,399.6		$ 1,373.4		$ 2,803.0	$ 2,952.3
Cost of sales	(941.7)		(908.5)		(1,853.9)	(1,887.0)
Gross margin	457.9		464.9		949.1	1,065.3
Selling, general and administrative expenses	(409.0)		(415.7)		(861.8)	(878.4)
Credit transaction, net	14.8		0.0		14.8	0.0
Other operating income, net	71.9		70.7		148.8	145.0
Operating income	135.6		119.9		250.9	331.9
Interest expense, net	(13.5)		(11.9)		(26.1)	(23.7)
Income before income taxes	122.1		108.0		224.8	308.2
Income taxes	(28.7)		(26.1)		(52.9)	(79.5)
Net income	93.4		81.9		171.9	228.7
Dividends on redeemable convertible preferred shares	(8.2)		0.0		(16.4)	0.0
Net income attributable to common shareholders	$ 85.2		$ 81.9		$ 155.5	$ 228.7
Earnings per common share:
Earnings per share: basic (usd per share)	$ 1.34		$ 1.06		$ 2.36	$ 2.94
Earnings per share: diluted (usd per share)	$ 1.33		$ 1.06		$ 2.36	$ 2.94
Weighted average common shares outstanding:
Weighted average common shares outstanding: basic (shares)	63.8		77.1		65.9	77.8
Weighted average common shares outstanding: diluted (shares)	70.5		77.2		66.0	77.9
Dividends declared per common share (usd per share)	$ 0.31	$ 0.31	$ 0.26	$ 0.26	$ 0.62	$ 0.52