Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Oct. 28, 2017	Oct. 29, 2016
Income Statement [Abstract]
Sales	$ 1,156.9			$ 1,186.2			$ 3,959.9	$ 4,138.5
Cost of sales	(835.8)			(836.2)			(2,689.7)	(2,723.2)
Gross margin	321.1			350.0			1,270.2	1,415.3
Selling, general and administrative expenses	(375.9)			(386.5)			(1,237.7)	(1,264.9)
Credit transaction, net	(12.2)			0.0			2.6	0.0
Other operating income, net	72.5			68.6			221.3	213.6
Operating income	5.5			32.1			256.4	364.0
Interest expense, net	(16.6)			(12.7)			(42.7)	(36.4)
(Loss) income before income taxes	(11.1)			19.4			213.7	327.6
Income taxes	7.2			(2.4)			(45.7)	(81.9)
Net (loss) income	(3.9)			17.0			168.0	245.7
Dividends on redeemable convertible preferred shares	(8.2)			(2.2)			(24.6)	(2.2)
Net (loss) income attributable to common shareholders	$ (12.1)			$ 14.8			$ 143.4	$ 243.5
(Loss) earnings per common share:
Earnings per common share: basic (usd per share)	$ (0.20)			$ 0.20			$ 2.24	$ 3.19
Earnings per common share: diluted (usd per share)	$ (0.20)			$ 0.20			$ 2.24	$ 3.18
Weighted average common shares outstanding:
Weighted average common shares outstanding: basic (shares)	60.1			73.5			64.0	76.4
Weighted average common shares outstanding: diluted (shares)	60.1			73.6			64.1	76.5
Dividends declared per common share (usd per share)	$ 0.31	$ 0.31	$ 0.31	$ 0.26000000	$ 0.26	$ 0.26	$ 0.93	$ 0.78000000