Deferred Revenue - Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017
Sterling Jewelers
Deferred Revenue Arrangement [Line Items]
ESP deferred revenue, beginning of period	$ 737.4	$ 715.1
Plans sold	269.2	290.8
Revenue recognized	(268.6)	(268.5)
ESP deferred revenue, end of period	738.0	737.4
Zale
Deferred Revenue Arrangement [Line Items]
ESP deferred revenue, beginning of period	168.2	146.1
Plans sold	140.1	150.1
Revenue recognized	(130.2)	(128.0)
ESP deferred revenue, end of period	$ 178.1	$ 168.2