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Restructuring Plans - Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		18 Months Ended
	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 14.0	$ 77.4
Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 27.8	$ 82.8	54.6	89.3	$ 180.5
Signet Path to Brillance | Cost of sales
Restructuring Cost and Reserve [Line Items]
Inventory charges	4.4	63.2	4.4	63.2
Signet Path to Brillance | Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Other Plan related expenses	23.4	$ 19.6	50.2	$ 26.1
Inventory charges | Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4.4				66.6
Termination benefits | Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6.0		14.8		24.5
Store closure and other costs | Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 17.4		$ 35.4		$ 89.4

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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