Deferred revenue rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 30, 2016	Aug. 01, 2015	Jul. 30, 2016	Aug. 01, 2015
Sterling Jewelers
Deferred Revenue Warranty [Roll Forward]
ESP deferred revenue, beginning of period	$ 723.8	$ 690.7	$ 715.1	$ 668.9
Plans sold	61.6	59.1	137.6	128.4
Revenue recognized	(65.1)	(58.4)	(132.4)	(105.9)
ESP deferred revenue, end of period	720.3	691.4	720.3	691.4
Zale
Deferred Revenue Warranty [Roll Forward]
ESP deferred revenue, beginning of period	155.1	129.3	146.1	120.3
Plans sold	31.9	29.4	72.5	64.6
Revenue recognized	(30.8)	(26.4)	(62.4)	(52.6)
ESP deferred revenue, end of period	$ 156.2	$ 132.3	$ 156.2	$ 132.3