Condensed Income Statements - USD ($) shares in Millions, $ in Millions	3 Months Ended						6 Months Ended
	Aug. 01, 2015	May. 02, 2015	[1]	Aug. 02, 2014	May. 03, 2014	[1]	Aug. 01, 2015	Aug. 02, 2014
Income Statement [Abstract]
Sales	$ 1,410.6			$ 1,225.9			$ 2,941.2	$ 2,282.0
Cost of sales	(919.8)			(816.9)			(1,884.5)	(1,465.8)
Gross margin	490.8			409.0			1,056.7	816.2
Selling, general and administrative expenses	(452.8)			(379.2)			(906.0)	(689.7)
Other operating income, net	62.8			53.7			126.3	107.7
Operating income	100.8			83.5			277.0	234.2
Interest expense, net	(11.1)			(13.7)			(22.1)	(15.5)
Income before income taxes	89.7			69.8			254.9	218.7
Income taxes	(27.5)			(11.8)			(73.9)	(64.1)
Net income	$ 62.2			$ 58.0			$ 181.0	$ 154.6
Earnings per share: basic (usd per share)	$ 0.78			$ 0.73			$ 2.27	$ 1.93
Earnings per share: diluted (usd per share)	$ 0.78			$ 0.72			$ 2.26	$ 1.93
Weighted average common shares outstanding: basic (shares)	79.7			79.9			79.8	79.9
Weighted average common shares outstanding: diluted (shares)	79.9			80.2			80.0	80.2
Dividends declared per share (usd per share)	$ 0.22	$ 0.22		$ 0.18	$ 0.18		$ 0.44	$ 0.36

[1] Signet’s dividend policy results in the dividend payment date being a quarter in arrears from the declaration date. As a result, the dividend declared in the fourth quarter of Fiscal 2015 of $0.18 per share was paid on February 26, 2015 in the aggregate of $14.4 million.